If a : b = 2 : 3 and c : b = 5 : 6, then a : ab : bc is equal to:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 2 : 12 : 15.
Given:
a : b = 2 : 3
c : b = 5 : 6
a : b : c = (2 × 2) : (3 × 2) : 5
= 4 : 6 : 5
a : ab : bc = 4 : (4 × 6) : (6 × 5) = 4 : 24 : 30 = 2 : 12 : 15