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Question

The subduplicate ratio of 9:1 is (x+y):(xy). Then x:y= _____

A
2:1
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B
1:2
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C
4:3
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D
6:4
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Solution

The correct option is A 2:1
The subduplicate ratio of 9:1 is 9:1=3:1
x+yxy=31x+y=3x3y
2x=4yxy=42=21

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