Question

Cindy collects baseball cards and hockey cards. For every hockey card Cindy has, she has five baseball cards. If Cindy has 840 total cards in her collection, how many of those cards would be baseball cards?

Answer 1

We will use B for the number of baseball cards and H for the number of hockey cards.

B = 5H
B + H = 840

Use substitution by plugging 5H in for B in the second equation.

5H + H = 840

6H = 840

H = 140

If there are 140 hockey cards, then there are 5*140 = 700 baseball cards.

So the answer is 700.