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In bag C, the ratio of red counters to yellow counters is 3:4. If 3 of the red counters are removed from bag C, the ratio of red counters to yellow counters is 3:5.

How many counters are in Bag C?

Bag C:
Before After
R:Y. R:Y
3:4 3:5
6:8. 6:10
9:12. 9:15
12:16. 12:20
15:20

20 is the highest common multiple.

15-3 also equals 12