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A. Tomás collects sports cards. The number of baseball
cards he buys each week is proportional to the number
of football cards he buys.

B. Suppose Tomas buys a total of 30 seconds baseball and football cards in Week 5. How many of each would he have to buy to keep the same proportional relationship?

Week = 1 | 2 | 3 | 4
NOBC = 9 | 15 | ? | 6
NOFC = 6 | ? | 8 |

NOBC ( number of baseball cards)
NOFC ( Number Of football cards )