book Maths Puzzle Numerical Ability

the area of a square is represted by 36x squared .which expression repersents the length of each side of the square?
1-- 6x
2-- 9x
3--6x squared
4-- 9x squared

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book Other Question

The measure of an angle is 6 more than twice the measure of its complement. Find the measures of both angles. Thank you. Five years ago, a man was seven times as old as his son. Five years hence, father will be three times as old as his son. Find their present ages.