exam Maths Puzzle Numerical Ability

I have to solve for x.
a/3 = x/21

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exam Other Question

Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x). PQR is an isosceles triangle such that QP=QR=13cm and the altitude PS=12cm . Find the length of PR ? (ANS- 14.4)