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Question

AB and when A = 16, B = 64.
If B = 81, then find the value of A.

A
18
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B
36
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C
9
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D
45
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Solution

The correct option is A 18
Given, AB
Let the constant of variation be k.
A=kB
Given, at A = 16, B = 64.
So,k=AB =1664=168=2.
Hence, at B = 81, the value of A=kB=(2)(81)=(2)(9)=18.

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