book Maths Puzzle Numerical Ability

How do you solve the square root of a fraction.
Example:The square root of 9/16.

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book Other Question

what is the square root of 100 A steel rod. 31 cm. long is to be cut into 3 parts, two of which parts are to be of equal lengths. The lengths of each of the 2 equal parts is 5 cm. more than the third part. Find their lengths.