Multiple choice

In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is- 10 वर्ष में A दो गुना हो जायेगा जितना कि B 10 वर्ष पहले था। यदि वर्तमान में A, B से 9 वर्ष बड़ा है तो B की वर्तमान आयु क्या है ?

  1. 35

  2. 37

  3. 38

  4. 39
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let B's present age be x years. Since A is 9 years older than B, A's present age is (x + 9) years. In 10 years, A's age will be (x + 19) years. Ten years ago, B's age was (x - 10) years. According to the problem: x + 19 = 2(x - 10). Solving: x + 19 = 2x - 20, so x = 39. Therefore, B's present age is 39 years.

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