exam Maths Puzzle Numerical Ability

.the area of a square bookcase is 21 more than the perimeter. find the length of a side

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exam Other Question

Solve this quadratic equation by Extracting square roots:

1. 1=1/3x^2 and
2. x/4=9/x The number of sides of two regular polygons are (n-2) and (n+1). Their interior angles differ by 27 degree. Find the number of sides of each polygon.

Plese help me find the so