book Maths Puzzle Numerical Ability

will you solve the following problems please?

1 3 # 3.w #5.Name like terms for : 5a+8-3a+11
# 1. - - -
2

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book Other Question

It takes 10 hours to fill a pool with water, and 20 hours to drain it. If the pool is empty and the drain is open, how long will it take to fill the pool? Find the value of "a" such that
y^2 - 18y + a
is a perfect square.