Fractions must be fractions and percentages

This is a question that our teacher has practiced for us more than 100 times, and I have memorized them all.

1.There are 58 students in the sixth grade (1) class, of which 14 29 are boys, and how many girls are transferred later, so that 8 15 girls are transferred to the total.

First calculate the number of boys at the beginning: 58 14 29 = 28 people, it is known that later girls accounted for 8 15 of the total, and the boys remained the same, then the boys were: 136% - 8 15 = 7 15, 28 7 15 = 60 people, this is calculated that the number of the whole class later, the more is the number of girls transferred:

60-58 = 2 people.

2. The bookstore shipped a children's storybook, which sold 30% on the first day, and sold 120% of the first day on the second day, 30 more than the first day. How many of these storybooks are there in the bookstore?

Calculate the next day to buy: 30% 120% = 36%, sell more than 30 copies, the corresponding score rate is: 36%-30% = 6%, the yield corresponds to the unit 1, 30 6% = 50, this is the first day to buy, then the total is 50 30% =

Total expenditures include food expenditures and other expenditures. Food expenditure accounts for 60% of total expenditure, then other expenditure accounts for 1-60% of total expenditure = 40%. It is known that 40% of the total expenditure is 480 yuan, and the total expenditure is obtained.

The total payouts for the month are:

1200 (yuan).

1. Ice turns into water, the volume is reduced by 1 11, and now there are 5 cubic decimeters of water, after it is frozen, what is the volume of cubic decimeters?

What is the volume of a 5 cubic decimeter piece of ice after turning into water?

2. Xiao Ming reads a story book, the ratio of the number of pages read on the first day to the total number of pages is 3:7, if you look at another 15 pages, it is exactly half of the book, how many pages does the book have?

3. There are 42 people in the mathematics interest group, of which 2 7 are girls, and a few more girls were added later, so that girls accounted for 2 5 of the total number, how many girls were added?

4. Two baskets of apples are 90 kilograms, 1 5 of the large basket and 1 4 of the small basket weigh 20 kilograms, how many kilograms of fruit are contained in the large and small baskets?

5.A book is 100 pages, read 60 pages, how many fractions of the book have been read?

6.The volume of water ice increases by 10, and the volume of ice becomes water decreases by a fraction?

7. There is a pile of sugar, of which the toffee accounts for 45%, and after putting 16 pieces of fruit candy, it only accounts for 25%, so how many pieces of toffee account for in this pile of toffee?

8.Given that the number of students in school A is 40% of the number of students in school B, the number of girls in school A is 30% of the number of students in school A, and the number of boys in school B is 42% of the number of students in school B, what is the percentage of the total number of girls in the two schools?

9. Fill the bottle with a bottle of water, pour out 1/2 of the total water, then pour the same amount of alcohol, pour out 1/3 of the whole solution, fill it with alcohol, and then pour out 1/4 of the whole solution, and then fill it with alcohol, then how many percent of the alcohol accounts for the whole solution at this time?

10. A school selected some students to participate in the essay competition, including 10 more male students than female students, the selection results, 50% of the female students won the award, 30% of the male students won the award, a total of 27 people won the award, how many students participated in the competition?

The price of a product is 80% of the original price after a 20% discount. According to the title, the selling price of a product after a 20% discount is 1 + 20% = 120% of the cost. The original selling price is 120% of the cost price 80% = 150%.

If not discounted**, the profit is 150% of the cost, 100% = 50%.

There are 120 tons in pile A, 1 4 was taken away, and 3 4 remained, that is, 90 tons. At this time, pile A is the 3 5 of pile B after 3 5 is transported, then pile B at this time is 90 divided by 3 5, which is 150 tons, and 150 is divided by its own percentage, that is, 3 5, which is the original quantity of pile B, that is, 250 tons.

If you get an 80% discount and a 20% profit, then the undiscounted profit is [1].

-1)x100%

A convenience store in May according to 5% of the turnover of the kina business tax of 9,000 yuan How much is the turnover of this convenience store in May.

The convenience store told Huaixiao in May that the business amount of Mingqiaoying socks was 180,000 yuan.

After the ratio is the unit one, the unit one knows to use multiplication, and the unknown uses division! So this question is 1028 (1-20%) yuan.

(1) Let A do x every day and B do y every day, and the total workload is 1.

The equation is x+y=9 40*1

3x+5y=7/8*1

Solving the system of equations yields y=1 10

Divide the total effort by y, i.e., 1 y = 10

2) Let the speed of the passenger car be x and the speed of the train be y.

According to the problem, the equation 8x+8y=4x+4y+125x+y=125 4

And because the total distance = 8x+8y

4*（x+y）