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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

Respuesta :

mhanifa

Answer:

  • 28 coupon books

Step-by-step 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