Five sixths of sixty is fifty, and five sixths of seventy-two is sixty.

Divide a 3m-long rope into five points, each point is (3/ 15) m, and each point accounts for (1/5) of the total length.

The product of 7 and 1 1 is the least three digits (77/ 100).

Three fifths of A equals five sixths of B, B is 36 and A is (50).

The tonnage of grain stored in warehouse B is two-thirds that of warehouse A, and the ratio of grain stored in warehouse A to warehouse B is (3:2).

The sum of number A and number B is 45, the ratio of number A to number B is 4: 5, number A is (20) and number B is (25).

The ratio of 12.5: 5 to the simplest integer is (5:2), and the ratio is (2.5).

Two: simplify the following proportions.

36: 15=( 12 :5) 0.25: 10=( 1 :40)

30 out of 42 = (5: 7) 102: 68 = (3: 2)

1 50cm:1m = (3: 2)

2/3: 8 = ( 1: 12)

1:9 2/3 =( 1:6)30:25 =(6:5)

0.25: 4 = (1:16)1kg: 500g = (2: 5)

Three: seeking proportion

63: 21= (3) 0.75: 0.25 = (3) 60 of 32 = (1.875)

65438 of 6+0:3 of 4 =(2/9)0. 125:5 of 8 =(0.2)

3: 65438+7/02 = (9/7) 3: 0.24 = (2.5) 2: 3.5 = (20/7)

14: 2 1=(4/3) 10: 0.4 = ( 1/40)

Four: column calculation

Five eighths of (1) 1 is 35. What is four sevenths of this number? 35÷5/8×4/7=32。

② Two thirds of a number is equal to the sum of 18 and 22. What's this number? ( 18+22)÷2/3=60.

Four sevenths of a number is 36. What's this number? 36÷4/7=63.

(4) 1 of a number is equal to 2/5 of b number, and b number is 20. What are numbers? 20×2/5÷ 1/3=24.

⑤ Three quarters of a number is 12 greater than 60. What's this number? (60+ 12)÷3/4=96

Two sevenths of a number is 16. What are two thirds of 1? 16÷2/7× 1/2=28/