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1.
In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, then the present age of B is
- A. 19 years
- B. 19 years
- C. 19 years
- D. 19 years
Answer: Option C
Explanation:
Let B's present age = x years.
Then, A's present age = (x + 9) years
∴(x+9)+10=2(x−10)⇔x+19=2x−20⇔ x=39
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