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OpenStudy (anonymous):
The ratio of the number of coins collected by Billy to the number of coins collected by Grace is 6 : 9. When they combined their coins, they had a total of 300 coins. How many coins did Billy collect? 50 coins 60 coins 120 coins 180 coins
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OpenStudy (jango_in_dtown):
Suppose Billy has 6x coins. Then Grace has 9x coins. so 6x+9x=300 implies 15x=300 implies x=20 implies 6x=120
OpenStudy (jango_in_dtown):
hence billy collected 120 coins
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