exam Maths Puzzle Numerical Ability

The length of a rectangle is 9 centimeters more than half the width. Find the length if they perimeter is 60 centimeters.

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exam Other Question
When a certain interger is divided by 15, the remainder is 7. Find the sum of the remainders if we divide the same integer by 3 and then by 5.

I keep getting the sim of 10...is this correct? simplifly the following :


1) 3x^3 y^4 z^-2 / 6x^-1 y^3 z^-3



2)36^1/2 / 15^2