exam Maths Puzzle Numerical Ability

Jonathan has 136 coins in this collection of dimes and quarters. If the coins have a total of $28, how many are dimes and how many are quarters?

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exam Other Question

Given f(x) = 2x - 5, find f(a + 3). Write 36x^2-360x-25y^2-100y=100 in standard form.

I know I am supposed to complete the square, but that is what I am having trouble with. Any help is very much appreciated!