Question

74. The students in three classes
are in the ratio 2:3:5. If 20
students are increased in each
class, the ratio changes to
4:5:7. Originally the total
number of students was :
(1) 50
(2) 90
(3) 100 (4) 150
​

Answer 1

Answer:

let the number of students be 'x'

no. of students added = 20 in each class

then ratio comes out to be = 4:5:7

so we get 2x+3x+5x+20=4x+5x+7x

by the statements

10x+20= 16x

16x-10x= 20

6x= 20

x= 10/3

2*10/3=20/3= 6.67

3*10/3=10

5*10/3=50/3=16.67

therefore total no. of students = 33.34

hope it works out for you!!!