Question

Q.44) The number of students in 3
classes are in
in the ratio 4: 5: 6. If 15
students are increased in each class this
ratio changes to
to 11:13:15.
11:13:15. The total
number of students in the three classes in
the beginning was
a) 165
b) 150
c) 175
d) 180​

Answer 1

Correct Answer:

D) 60

Let the number of students be 3x, 4x and 5x.

Then (3x + 15) : (4x + 15) : (5x +15) = 6 : 7 : 8

3x+156=4x+157

= 5x+158

= > 7(3x +15) = 6(4x + 15)

X = 5

Total number of students before increase = >12x = 60