Question

the student in the class are in the ratio of 2 :3:5 if 80 students are increasing In classes the ratio changes to 6: 7: 9 what was the total number of student in three classes before the increase

Answer 1

if the ratio of the student in the class is

2:3:5

let X

2x+3x+5x=80

10x=80

x=8

2x=2*8=16

3x=3*8=24

5x=5*8=40