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How to do the fourth question on page 65 of the sixth volume of primary school mathematics exercises and tests by Jiangsu Education Edition?
The fourth question on page 64

7/6-9/8= 1/24

1/( 1/24)=24 (human) boys

24/(8/9)=27 (human) girl

The fifth question on page 65

207/(1-10%) = 207/90% = 230 (yuan)

The sixth question on page 65 is 3: 2 6: 5.

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