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Adam who is 20 years old is 4 times as old as Mary. What will be Mary’s age when Adam is twice as old as her?
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- 35 years
- 15 years
- 30 years
- 17 years
Correct Option: B
Age of Adam = 20 years
| Age of Mary = | = 5 years | 4 |
Let after P years , Adam’s age = 2 × Mary’s age.
⇒ 20 + P = 2(5 + P)
⇒ 2P – P = 20 – 10 ⇒ P = 10 years, later
⇒ At that time Mary’s age = Age of Mary + 10 years = 5 +10 = 15 years
