Answers

2014-10-19T23:14:13+05:30
enrolment this year = 552
let the last year's enrolment be x
 so this year's enrolment is 115x/100
 ATQ,
23x/20=552
⇒x=552X20/23=480
so last year's enrolment was 480 students.
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2014-10-24T09:06:42+05:30

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This years enrolment = (last year's enrolment + 15/100 of last years' enrolment)
             552   = 115/ 100 * last years' enrolment

last year's enrolment = 55200/115 = 480 students.

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