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oobleck - oops
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Oops. I didn't see that only 4 members of the family are riding. So the cost per person is 15 + 10/4 = 17.50 because they split the $10 fee 4 ways. also, for the 2nd part you need 100 < 10+15n 15n > 90 so n > 6 So, you still need 7 or more, because the
