book Maths Puzzle Numerical Ability

1)
if x=2, what is y #2) if x=2/3, what is y #3) if x=3.25, what is y

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book Other Question

A collection of dimes and quarters is worth $5.45. There are 32 coins in all. How many of each type of coin are there?

so for this one, i know that we should make D=dimes and Q=quarters.. but thats where my knowledge ends. Hello,
Can you please show me how to simplify this? I need to know in steps. (x-2) (2x+3)