Let x be the number of students.
If there were 10 students more, each of them would have to pay $ 30
coach rent = (x+10)(30)
If there were 8 students less, each of them would have to pay $50.
coach rent = (x+-8)(50)
(x+10)(30) = (x-8)(50)
30 + 300 = 50 - 400
700 = 20x
x = 35
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