book Maths Puzzle Numerical Ability

A sum of money amounting to $5.15 consists of 10 cents and 25 cents. If there are 32 coins in all, how many 25 cents are there?

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book Other Question

Could you help me to complete the square to solve x^2-8x-12=0? i do not understand polynomials AT ALL so any help would greatly be appreciated
(2x squared +3x - 5)+ (7x squared -x+7)=
i tried it and this is what i got for the answer
9xsquar