Grade 6 Math Fraction Percentage Application Problem Collection Help, Difficult .

1. There are 290 grams of an alloy of copper and silver, of which the mass of copper is 10 grams less than 25% of silver, how many grams of silver and copper are in this alloy?

Silver has. 290 10) (1 25) 240 (g).

Copper has. 240 25 10 50 (g).

2. A school has built a new teaching building, and the actual investment is 1.26 million yuan, which is 10% less than the plan, and the planned investment is how many percent of the actual investment? (The number before the percent sign is kept to one decimal place).

Plan to invest. 126 (1 10) 140 (10,000 yuan).

Planned investments are actual investments.

3. The cooperation of two teams A and B for a project is completed in 6 hours, and the efficiency ratio of the two teams is 3:2. How many days does it take for A and B to do it alone?

A completes the work every day.

B completes the works every day.

A alone needs to do it.

1 1 10 10 (day).

B alone do the need.

1 1 15 15 (day).

4. A ** book, the ratio of the number of pages that Xiaofang has read to the number of pages that she has not read is 2:5, if you look at another 27 pages, it accounts for exactly half of the book, how many pages are there in this book?

It turns out that the total number that has been looked at is already seen.

This book is shared.

27 (1 2 2 7) 126 (pp.).

5. 360 tons of water used in July, 40 tons less than in June, and how many percent less than in June?

6. Master Wang wants to process 720 parts, of which 36 are unqualified, and the pass rate is sought?

1 Set silver x gram 25% x-10 + x = 290 solution x = 240 g copper = 290-240 = 50 grams.

2 126 (1-10%) = 1.4 million yuan 140 126 =3 A B = 3 2 A = 3 B 2 Total project = (A + B) x 6 = 15 B A days = 15 B 3 B 2 = 1 day.

B with days = 15 B B = 15 days.

4 Suppose there are x pages The ratio of the number of pages seen to the number of pages not seen is 2 5, that is, 2 7 is seen, and 5 7 is not seen, then 2x 7 + 27 = x 2

Solution x = 126 pages.

.There are 80 bottles of Coke in the store, and the number of bottles of Coke is 1/5 less than that of Sprite, how many bottles are there in Sprite?

Answer; There are 80 bottles of Coke in the store, and the number of bottles of Coke is 1/5 less than that of Sprite, how many bottles are there in Sprite?

Sprite has 80 (1-1 5) = 100 (bottle).

2.A train from Shanghai to Tianjin, has traveled 808 kilometers, there is still 1/3 left to run, how many kilometers is the railway from Shanghai to Tianjin?

Answer: A train from Shanghai to Tianjin, has traveled 808 kilometers, there is still 1/3 left, how many kilometers is the railway from Shanghai to Tianjin?

The railway length from Shanghai to Tianjin.

808 (1-1 3) = 1212 (km).

3.There is a batch of potato chips in the mall, which sells two-fifths of the total in the morning and six-eighths of the total in the afternoonThere are 54 bags left that are not sold How many bags are there in this batch of potato chips?

A: There is a batch of potato chips in the mall, which sells 2/5 of the total in the morning and 4/8 of the total in the afternoonThere are 54 bags left that are not sold How many bags are there in this batch of potato chips?

This batch of potato chips has:

54 (1-2 5-4 8) = 540 (bag).

4.Uncle Zhang's family has 15 peach trees, and the number of pear trees is two-thirds of that of peach trees and two-sevenths of apple trees.

Answer: Uncle Zhang's family has 15 peach trees, and the number of pear trees is two-thirds of that of peach trees and two-sevenths of apple trees.

Pear trees have 15*2 3=10 (trees).

Apple trees have. 10 (2 7) = 35 (trees).

5.There is a job, A and B 2 people work together for 5 days to complete, and the workload of A in one day is 15% more than the workload of B in one day, how many days does it take for A and B to do this work alone?

Answer: If B's workload in one day is unit 1, then A is 1+15%=115%.

Then B's workload in a day is: (1 5) (1+115%)=4 45

A is: 4 45 * 115% = 23 225

That is, it is not difficult for A to be alone: 1 [23 225] = 225 23 days, and B to 45 4 days.

The fifth grade of a school originally had 2 classes, but now it will be reorganized into 4 classes. The 1 3 of the original 1 class and the 1 5 of the original 2 class will be formed into the new 1 class. The 1 5 of the original 1 class and the 1 3 of the original 2 class will be formed into the new 2 class.

The remaining 42 people form the new 3 class and the new 4 class, if the new 2 class is 2 13 less than the new 1 class, then how many people are in the original 2 and a half and the original 2 classes?

A sports school has a number of balls, of which basketball accounts for 25, and later bought 5 basketballs, at this time basketball accounts for 3 10 of the total, how many balls are there?

We originally planned to plant 12 hectares, but we actually planted 14 hectares. How many percent of the actual afforestation has increased compared to the original plan?

We originally planned to plant 12 hectares, but we actually planted 14 hectares. How many percent of the planned afforestation is actually less?

There was a pile of yellow sand weighing 120 tons on the site, 25% of it was transported on the first day, and 20% of it was transported on the second day

The number of geese is twice that of ducks, and the number of ducks is a percentage less than that of geese?

If the price of a product is increased by 20% and then reduced by 20%, is the current price equal to the original price? Why?

If the North China Hualian Supermarket is engaged in ** activities, all goods are at a 95% discount**, in fact, the merchant is to increase the original price by 20%, and then to 95% off**. Will you take advantage of the current ** period to buy goods? Talk about what you think

A monkey eats the peaches on the tree, eats all 20% on the first day, eats the remaining 25% on the second day, and finally has 60 peaches left on the tree. How many peaches were there on the tree?

The master and apprentice work together on a batch of parts, which can be completed in 20 days. The ratio of work efficiency between master and apprentice is 3:2. What percentage of each of the two apprentices complete this batch of parts per day?

A rope is 60 meters long, the first cut is 25 meters, and the second cut the remaining 40%. How many meters does it take to cut the rope twice?

A barrel of oil, the first time to take out its 20, the second time to take out 36 kilograms, two times to take out a total of half of this barrel of oil. How many kilograms does this barrel of oil weigh.

Then this question can be understood like this: according to this condition: the remaining deposit is obviously 400 yuan less than Lili, and the total amount of money in the passbook of the two people is 14,400 yuan.

obviously has 7,000 yuan left;

Lili still has 7,400 yuan;

It turned out to be clear. 7000 (1-20%) = self-counting.

It turned out to be Lili. 7400 (1-20%) = self-counted.

Obviously, the total amount of money is less than Lili: 400 (1-20) = 5000 yuan Lili later had: (14400 + 5000) 2 = 9700 yuan Lili originally had:

9700 (1-20) = 12125 yuan, obviously later: 14400-9700 = 4700 yuan, obviously the original was: 4700 (1-20) = 5750 yuan.

The total amount of money is x

Obviously yx-20%x-400=y-20%y

x-20%+y+20%=14400

1 All 1Guangming Village has 121 color TVs per 100 households this year, an increase of 66 units over last year, and an increase of several percent this year over last year? (There must be an equation).

2.To do a job, A can complete it in 5 days, B can complete it in 4 days, and what fraction of the work A can complete every day? What percentage of the day can B do this work? How many percent is B working faster than A? (There must be an equation).

A: 1 5=1 5, B: 1 4=1 4, (1 4-1 5) 1 5=1 20 1 5=

3.How many percent of the planks might be wasted by using a board 1 meter long and 8 decimeters wide to make the largest meta-tabletop? (There must be an equation).

1 meter = 10 decimeters.

10*8=80 square decimeters.

square decimeters. 4.The largest island in the world is Greenland, with an area of about 2.18 million square kilometers, while the largest island in China, Taiwan, is about less than Greenland, and the area of Taiwan is about 10,000 square kilometers? (keep two decimal places) (with an arithmetic).

218* (10,000 km².)

5.A road that has been paved for 240 meters, which is exactly 20% of the road, how many meters is this road long? How many meters are left unpaved? (There must be an equation).

240 20%=240 meters.

6.In the plan of household appliances going to the countryside, farmers can enjoy a 13% subsidy given by the ** when they buy any designated products for electricity in the countrysideAunt Zheng of Wangyuan Village bought a Shuanglu refrigerator, how much yuan did it actually spend after the reduction? The refrigerator costs 1580 yuan. (There must be an equation).

1580*(1-13%)=1580*RMB.

2.A: 1 divided by 5 = 1 5 = 1 fifth.

B: 1 divided by 4 = 1 4 = quarter.

Party B is more efficient than A:

1/4-1/5)/(1/5)*100%=25%3.The diameter of the round table top is determined by the width, that is, the diameter r = 8 decimeters = meters The percentage of wasted material is as follows

Area of the rectangle - Area of the circle) Area of the circle * 100% = [1*

10,000 square kilometers of meters.

Explanation: If you do the application questions, the above 6 questions must be solved in the front, and you must answer in the back: you will come by yourself.

1.66 (121-66) Last year, unit 1 increased by 2A 1 5=1 5 B 1 4=1 4 (1 4-1 5) 1 4 A unit a high comparative.

3.1 m = 10 dm (10 8-4 )10 84 218×（

6.1580 (1-13%) You sixth grade is so simple unlike us.

Ever studied the unknown?

The following x is the multiplier sign.

A's daily workload is 3 x C's daily workload.

A's daily workload 2x B's daily workload.

2x B's workload in one day 3 x C's workload in one day.

B's workload in a day C's workload in a day.

A three-day workload 3x3 x C's one-day workload = 9 x C's one-day workload B C's one-day workload = C's one-day workload + C's one-day workload C's one-day workload A three-day workload divided by B-C's one-day workload 9x C's one-day workload divided by C's one-day workload If you have learned the unknown, set C's one-day workload to x, and the equation is the same as above, if you are satisfied, click to adopt.

The questions of the application, the Chinese teacher recommended two readings A and B, all students purchased at least one book per person. Students know that 2 3 bought it, 5 8 students bought B, and 14 bought both classmates. How many students are in the classroom?

Secondly, during the holidays, Red bought a comic book, read the book 1 4 on the first day, read the remaining 1 4 on the second day, and read 12 on the second day is known. What are the total number of pages in this comic?

Calculation questions: 24/60 = 60 80 = 400 *(1 +25 )=

Solution: From the meaning of the question, B = 1 2 A, C = 1 3 A.

1 (1 2+1 3)x3=1 (5 6)x3=6 5x3=18 5 (days).

Eighteen out of five.

Let the total be six, six, three and two, then 3 days A is 18, B and C cooperation is 5, and the work will be completed in 5 18 days by B and C.

That is, eighteen out of five.

It seems like three days! Not so sure.

23 5 = 460 (yuan).

460 + 2000 = 2460 (yuan).

A: Mr. Yang's monthly income is 2,460 yuan.

The corresponding amount of 23 yuan is 5% of the part exceeding 2000 yuan, so Mr. Yang's monthly income is 23 5% + 2000 2460 yuan.

23 5% = 460 yuan is the salary that Mr. Yang needs to pay tax.

Plus the basic $2000.

Mr. Yang's monthly income is 2,460 yuan.