Verified Answer :

konrad509

\(15x+3x=90\\ 18x=90\\ x=5\\\\ 15x=15\cdot5=\boxed{75}\)

Jerboa

90/3 = 30
3015=450 Students

To check: 15:3  (divide by three)
                   5:1
So should be five times as many students.
905=450 :) Hope this helps :)

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