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1. The ratio of ages of a father and his son was 5 : 1. What is the age of the son after five years, if the ratio of their ages is 3 : 1 by this time?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option B
Explanation:
Father = 5x
Son = x
So, ( 5x + 5) : ( x + 5) = 3 : 1
5x + 5)/ x + 5 = 3/1
5x + 5 = 3x + 15
2x = 10
x = 5
After 5 years son age = 5 + 5 = 10
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