The sum of the age of a father and his son is 100 years now. 5 years ago their age was in the ratio of 2 : 1. The ratio of the age of father and son after 10 years will be:
Answer & explanation
Correct answer: option 1
Age of father and son 5 years ago = 100 - 2 × 5 = 90
F : S
2 : 1 [3R = 90 ⇒ 1R = \(\frac{90}{3}\) = 30]
×30 ×30
60 30 (age 5 years ago)
+5 +5 (at present)
+10 +10 (after 10 years)
75 45
5 : 3
Now,
Required ratio = F : S = 5 : 3