B was born when A was 4 years 7 months old and C was born when B was 3 years 4 months old. When C was 5 years 2 months old, then their average age was:
Answer & explanation
Correct answer: option 4
A − B = 4years 7months ... (i)
B − C = 3years 4months... (ii)
By adding both the equations we get,
A − C = 7years 11months
Given : When,
C = 5 years 2 months
∴ A = 13 years 1 month
B = 8 years 6 months
Average = \(\frac{A + b + c}{3}\)
= \(\frac{26 \; years\; 9 \;months}{3}\)
= 8 years 11 months