Question

Kate's soccer team is selling coupon books and recipe books to raise

money for transportation to their games. Coupen books cost $12 each
and recipe books cost $7.50 each. If Kate sold a total of 42 books and
raised $441, how many coupon books did she sell?
plz help me

Answer 1

• 28 coupon books

Explanation:

Let the number of coupon books be c and recipe books be r.

Then we have following equations:

• c + r = 42
• 12c + 7.5r = 441

Substitute r in the second equation and solve for c:

• r = 42 - c
• 12c + 7.5(42 - c) = 441
• 12c - 7.5c + 315 = 441
• 4.5c = 441 - 315
• 4.5c = 126
• c = 126/4.5
• c = 28