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Question

If y is inversely proportional to cube of x, and x=5 when y=1, find the value of y, when x=3

A
12527
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B
1253
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C
527
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D
53
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Solution

The correct option is A 12527
Given that y1x3y=kx3

Given,
At x=5, the value of y=1
Substituting value in above equation
1=k53k=125

At x=3 , let's find y
y=kx3
y=12533 (k=125 and x=3)
y=12527

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