Since they’re vertical we know that they’re congruent. We write the equation as 160=10x+50. Subtract 50 to both sides then we get 110=10x so now we divide 10 to both sides and get 11=x.
So your answer is A
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You can fit 2 in each or 3 can have some in it
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Combine 5x and x and that makes 6x+3