exam Maths Puzzle Numerical Ability

how do you solve the question at lake taylor middle

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Divide this, please. Thanks.

(p^2 - q^2)/(p+q) divided by (p+q)/(p-q) Let A be the set of all composites less than 10, and B be the set of positive even integers less than 10. How many different sums of the form a + b are possible if a is in A and b is in B?