exam Maths Puzzle Numerical Ability

I am having trouble with this math problem please help me.
Joe read 150 books in 3 years.Write the two rates(ratios) implied by this statement.How long would it take Joe to read 560 books at the same time.

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exam Other Question
Subtract write your answer in simplest form.
2y/y-4 - 3y/+3

Thank you very much. The problem is Find the Amplitude, period, and phase shift(s) of the function.
f(x)=4cos(x + (pi / 3))