Question

The enrolment in a school this year is 552. This is an increase of 15% over last year's enrolment. How many were enrolled last year?​

Answer 1

Answer:

Given: Enrollment of this year= 552

Enrollment of last year= let us suppose 'z'

Increase in enrollment = 15%

Here,

Enrollment of this year= 15% of z + z

552= [15/100]*z+z

552= [15z/100]+z

552= [15z+100z]/100

552*100= 15z+100z

55200= 150z

z= 368

Answer 2

Step-by-step explanation:

let the number of enrollment of last year=x

now,(100+increase%/100×x)=552

(100+15)/100×x=552

115/100×x=552

x=552×100/115=480