How many paperback books did they sell? How many hardback books did they sell?

Question

At a library book sale, paperback books cost $0.50 each and hardback books cost $1.25 each. At the sale, they sold 80 books and made $62.50.

Answer 1

p represents the number of paper backs

80 - p represents the number of hard backs

0.50p + 1.25(80 - p) = 62.50

Can you solve for p and answer?