Ask for answers, 6th grade, math, extra points for correct answers

Let the original speed be x kilometers per hour, and it will take t t hours to travel at the original speed to get from place A to place B, then there is an equation.

1+20%)x*(t-1)=tx From this, the relationship between x and t is substituted into the following formula.

120/x+（xt-120）/（1+25%）x=t-2/3

If you can use a system of equations, this problem is too simple, this is an elementary school problem, and there seems to be no equations in elementary school. Moreover, it is a relatively complex system of multivariate multiple equations.

Solution: Assuming that Master Wang's original arrival time is x hours, then:

x/x-1=20%

Get x=6Assuming that Master Wang's original speed is y kilometers per hour, then:

120/y+(6y-120)/

Get y=45

Therefore, the distance between A and B is 45*6=270 kilometers.

Solution: Let the original speed be x kilometers per hour, and it will take t hours to travel at the original speed from place A to place B.

1+20%）x*（t-1）=tx

So. 120/x+（xt-120）/（1+25%）x=t-2/3

Give you a hint and you'll figure it out.

Let A and B be separated by x kilometers, and the original speed will be set to y kilometers per minute.

Then column the equations.

Solution: Let A and B be separated by x kilometers.

20%xx60=120x45%x-40

12%x=54%x-40

42%x=-40

x=95

From the inscription, the younger sister walks 1 16 per minute, and the elder brother rides 1 5 per minute, and they meet in 1 (1 5 + 1 16) = 80 23 minutes. Sister speed: 250 (80 23) = 575 8 (m min), the whole process 575 8 * 16 = 1150 (m).

The speed ratio is 5 to 16, so my brother walked 250*16 5 = 800 meters and the road 1050 meters.

When the brother and sister meet, they walk for the same amount of time, so the ratio of s is 16 to 5

The s that my sister walks is 250, then my brother walks 250*16, and my brother walks 800

The two plus is 1050

Let my sister walk at a speed of xm minutes and my brother ride at a speed of ym minutes.

Distance = 16x = 5y = 250 + y (250 x).

Solution distance = 1050m

If the list price is x yuan, then, x=80

20*5%+30*10%) (20+30)=8% If the number B is 100, then the number A is 120, and the number B is less than the number A (20 120*100%=

If there is a shift of x days, there is a shortage of 30-x days, so 48x=12(30-x), x=6

5 is a few percent of 8 5 8*100%=

8 is a percentage of 5 8 5*100%=160%5 is a percentage less than 8 (8-5) 8*100%=8 is more than 5? (8-5) 5*100%=60%75% more than (60)25%.

Forty percent less than sixteen.

A product is 480 yuan, and now it is 120 yuan off for 300 yuan, how much discount is actually given to this product?

6% off.

(1) (5 8)% = five divided by eight times 100 percent equals 62.5 percent, the same as below.

6) (7) (480-120) 480 = 75% discount (8) 30 + 2000-30 = 2570 yuan.

How I look like a third grader.

The Wolf Hunter team will answer for you.

"One-third less mass of oranges than apples" means that the part of oranges with less mass than apples is equivalent to (1, 3) of (apples).

The number of white rabbits is two-fifths more than that of black rabbits" means that the number of white rabbits is more than that of black rabbits (2 5), and the number of white rabbits is equivalent to (7 5) of (black rabbits).

The school library has 200 science and technology books, and the number of reference books is a quarter less than that of science and technology books. How many reference books are there?

You can first calculate how many reference books are (less) than science and technology books, the equation is (200 1 4), and then how many reference books are there? Comprehensive formula: 200-200 1 4=200 3 4=150 volumes.

You can also find out how many copies of the reference book are equivalent to the science and technology book, and then directly calculate how many copies of the reference book are there? Comprehensive Formula:

200 (1-1 4) = 200 3 4 = 150 volumes.

The original price of a refrigerator was 2,400 yuan, but now the price is five quarters lower than the original. How many dollars has the price been reduced? How much does it cost now?

The price is reduced: 2400 5 24 = 500 yuan, the current price: 2400-500 = 1900 yuan or 2400 (1-5 24) = 2400 19 24) = 1900 yuan).

The train travels an average of 120 kilometers per hour, and it travels 28/15 from A to B, reaching the midpoint of the two places. How many meters apart from A and B?

28 15 units should be hours!

Distance between A and B = 2 (120 28 15) = 448 km.

3 1

2400 2400 588=1812 I don't understand the last question. Twenty-eight fifteenths of a year was driven from A to B???

Apples a third.

Black Rabbit 2 out of 5 Black Rabbit 7 out of 5.

More than 200 quarter=50 200-200 quarter=150

1-quarter = three-quarters 200 three-quarters = 1502400 five-quarters = 500 2400-500 = 1900 What does twenty-eight out of fifteen mean in the last question? Is there a unit?