book Maths Puzzle Numerical Ability

Find the value of "a" such that
y^2 - 18y + a
is a perfect square.

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book Other Question

From the same store, Anne bought 3 loaves of bread and 2 bottles of milk for $15.30, and Joe bought 2 loaves of bread and a bottle of milk for $9.20. What is the price for one of each? Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How mamy of each type of question are on the test? please help me to sovle it. thank you.