a : b = 4 : 7, b : c = 5:6 হলে a:b:c= ?

a : b = 4 : 7, b : c = 5:6 হলে a:b:c= ?

A 4:7:6

B 20:35:24

C 24:25:30

D 20:35:42

Solution

Correct Answer: Option D

a:b= 4:7
= (4x5):(7×5)
=20:35
b:c=5:6
= (5x7):(6×7)
=35:42
∴a:b:c=20:35:42