Discussion of Question with ID = 015 under Square-and-Cube-Roots

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Question

One-fifth of the square-root of which number is 0.6?

A

9.

B

16.

C

4.

D

25.

Soln.
Ans: a

Let the number be n. So ${1/5} × √n$ = 0.6, which gives $√n$ = 5 × 0.6 = 3. so n = $3^2$ = 9.


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