book Maths Puzzle Numerical Ability

If y varies inversely as x^2, and y = 2 when x = 4, what is the constant variation?

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book Other Question

If 5 is added to the sum of two consecutive integers, the result is three less than twice the larger integer. Find the integers.

I keep getting 8 2a+7/(8a^2-2a-1) + a-4/(2a^2+5a-3) = 4a-1/(4a^2+13a+3)