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The answer to the next math textbook in six years.
9. Solution: Let the actual height be xcm.

19.6:x= 1: 10

x= 19.6× 10

x= 196

Answer; Actual height 196cm.

10.( 1) Solution: 5: 8 = 40: x

5x=8×40

x=64

(2) Solution: X: 3/4 = 1/5: 2/5.

2/5x=3/4× 1/5

2/5x=3/20

x=3/8

(3) Solution: 1.5: x = 3.6: 4.8.

3.6x= 1.5×4.8

x=2

(4) solution: x:2=5:2.5

2.5x=2×5

x=4

1 1. solution: make the model height xm.

35:x=500: 1

500x=35× 1

x = 35÷ 500

x=0.07

0.07 m = 7 cm

A: The height of the model is 7 cm.

12.( 1)3:8= 15:40 8:3=40: 15……

(2)2.5:0.5=2:0.4 0.5:2.5=0.4:2……

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