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9. The four numbers 7, 18 and 20 can form several groups of Coprime numbers
9 and 7 9 and 20 9 and 4
7 and 18 7 and 20 7 and 4
There are () which can be proportional to 3 / 5, 1, 9 / 100
3
3/5:1=9/100:(3/20)
1:3/5=9/100:(27/500)
1:9/100=(20/3):3/5
If you add a number to 4 / 5, 0.32, 0.4, what is the ratio?
The method is 4 / 5 = 0.8
(0.8×0.32）÷0.4=0.64
（0.8×0.4）÷0.32=1
（o.32×0.4）÷0.8=0.16
The above three can be combined with them in proportion (1) 4 / 5:0.4 = 0.64:0.32
(2)4/5:0.32=1:0.4
（3）0.32:0.8=0.16:0.4
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