Multiple choice

The ratio of the present age of A and B is 4:7. After 5 year B’s age will be 40 year. Find the present age of A.

  1. $40$
  2. $30$
  3. $20$
  4. $None of these$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Present ratio A:B = 4:7. After 5 years, B's age = 40 years. So B's present age = 40 - 5 = 35 years. Since A/B = 4/7, A = (4/7) × 35 = 20 years. Present age of A is 20 years. Always work backwards from future information to find present values.

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