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Tracey is shopping for candy for her party and needs lollipops and gummy bears for a display she is making. Lollipops are $1 per pound and gummy bears are $0.75 per pound. She knows she wants to spend exactly $15 on candy. If she spent $6 on lollipops, which of the following is the number of pounds of gummy bears she purchased?

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iamsriracha
Tracey can buy 12 pounds of gummy bears. 

She bought 6 pounds of lollipops for $6, and that leaves her with $9 left to spend. If we multiply $0.75 dollars per pound by 12 pounds, we get $9. Therefore, that is the amount of bears to buy. You can also divide $9 by $0.75 and get 12 pounds.