1 / 4 ton: 0.75 kg Soon,

1 / 4 ton: 0.75 kg Soon,

Quarter ton: 0.75kg
=（1/4*1000kg）/0.75kg
=250/0.75
=10000/3

It's wrong. It's 43
E forgot
In 2005, China's train speed was increased for the fifth time. A train from a city to B city, the original average speed is 100 km / h, the whole journey takes 8 hours, now only 6 hours.
(1) How much shorter is the time now?
(2) How much faster is the average speed of this train than before? (one decimal place before the percent sign) percent sign%

（1）6/8=3/4
1-3/4=1/4=25%
(2) 8 × 100 △ 6 is the current speed
(8 × 100 △ 6) / 100 ≈ 1.333 the current speed is 1.333 times of the original speed
(1.333-1) × 100% = 33.3%, which is the final result of the problem

How to do the fourth question on page 25 of volume one of grade four

Few of them have books

1. A piece of cloth is 120m in total. If you make a coat alone, you can make 80 pieces; if you make pants alone, you can make 120 pieces. If you make a coat with a pair of pants, how many sets can you make in total?
2. It takes 8 hours for car a to complete the whole journey from a to B, and 10 hours for car B to complete the whole journey from B to a?
3. If Xiaohong enters a manuscript separately, it takes 5 hours; if Xiaofang enters it separately, it takes 4 hours. If two people cooperate, how many hours does it take to enter this manuscript?
4. For a project, if team a does it alone, it will complete one sixth of the project every day; if team B does it alone, it will complete one eighth of the project every day. How many parts of the project can be completed after three days' cooperation between the two teams? How many parts of the project are left?
5. To process a batch of parts, it takes 10 days for Master Wang to process alone, and 15 days for Master Li to process alone. How many days can master Wang and master Li cooperate to complete 2 / 3 of this batch of parts?

1. A coat needs: 120 △ 80 = 1.5m, a pair of trousers needs: 120 △ 120 = 1m, set up a complete set to do, a total of X sets can be made: (1.5 + 1) x = 120 solution: x = 120 △ 1.5 + 1 = 48 sets 2, set two cars to meet in X hours: (1 / 8 + 1 / 10) x = 1 solution: x = 1 △ 1 / 8 + 1 / 10) = 4

Calculate the ratio. (urgent!) 16:12 21:7 9:81 35:49

16:12=16÷12=4/3
21:7=21÷7=3
9:81=9÷81=1/9
35：49=35÷49=5/7

（ ）*11/4=9*（ ）=（ )*5/7=1*( )

4/11 1/9 7/5 1

(- 7.5) * (- 11 and 1 / 9) - 7.5 * 1 and 1 / 9 + 7.5 * 6
Love! Urgent!

(- 7.5) * (- 11 and 1 / 9) - 7.5 * 1 and 1 / 9 + 7.5 * 6
=7.5 * (11 and 1 / 9) - 7.5 * (1 and 1 / 9) + 7.5 * 6
=7.5 * (11 and 1 / 9-1 and 1 / 9 + 6)
=7.5*16
=120

The ratio of four fifths to seven sixths

One and four fifths: seven sixths
=9 out of 5: 7 out of 6 multiplied by 30 at the same time
=54:35
=54 out of 35

Ratio: 1:3 and 5:1 and 1:7
125:1 and 1 / 4
200 square centimeter: 20 square decimeter

Ratio = the first term of ratio △ the second term of ratio
3 and 1 / 5:1 and 1 / 7
=1 / 3 / 5 △ 1 / 7
=16 / 5 ÷ 8 / 7
=14 out of 5
=Two and four fifths
125:1 and 1 / 4
=9 / 8 ／ 5 / 4
=9 out of 10
200 square centimeter: 20 square decimeter
=2 square decimeters △ 20 square decimeters
=1 in 10

5: The ratio of seven fifths is

5: The ratio of 7 out of 5 is 25:7