book Maths Puzzle Numerical Ability

simple interest= amount of deposit x interest rate (decimal) x time (years)

deposit $250
5.5 interest
0.5 year

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book Other Question

My book says that:

[ (x^2 - y^2) / (4x + 4y) ] / [ (3y - 3x) / (12x^2) ]



But no matter what I do, I can only find x^2.
Help. Thank you.
Simplify the radical.
4 radical sign 3 + 2 radical sign