exam Maths Puzzle Numerical Ability

Multiply

8pq2(2pq - 3p + 5q)

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Tutor: Could you help me please? How do I find the LCD for 7/a^2+2a-63, 8/a+9
I have no idea how to do this problem. I'm trying to follow the steps on the practice worksheet bu three pieces of 25 cents and two pieces of a cent have a mass of 27 grams. two pieces of 25 cents pieces and six pieces of a cent have a mass of 32 grams. how is the mass of each pieces