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If 81 : y :: y : 196, find the positive value of y.
Question

If 81 : y :: y : 196, find the positive value of y.

A.

132

B.

134

C.

126

D.

128

Correct option is C

Given:

81 : y :: y : 196

Solution:

​81y=y196 y2=81×196  ⟹ y=126\frac{81}{y} = \frac{y}{196} \\ \ \\y^2 = 81 \times 196 \\ \ \\\implies y = 126​​

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