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Jamie was throwing darts at targets. When his dart landed in the center of the target(the bull eye)and he earned 7 points. However, when his dart landed on the outside ring he earned 2 points. After 50 throws his friend reported his score to be 160 points. Jamie wanted to know how many bulls eyes he had hit, but his friend did not know. how many bulls eyes did Jamie hit?

Let x = number of hits on the bull's eye, then 50-x = number of hits on the outside ring.
7x = points from bull's eye.
2(50-x) = points from ring.
7x + 2(50-x)=160
solve for x.
Check my thinking.

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