Question

The students in 3 classes are in the ratio 3:4:5. If 20 students added in each class, the ratio becomes 5:6:4. Find the total no. of Students in all the classes now?​

Answer 1

Answer:

I am not sure if it is right but

let the students in the classes be 3x, 4x,5x and 5x , 6x, 4x

when 20 students are added in each class then ,

3x+20=5x

4x+20=6x

5x+20=4x

when added

12x+60=15x

15x-12x=60

3x=60

×=20

when substituting in 5x 6x and 4x

5×20=100

6×20=120

4×20=80