A is 14 years old and B was thrice as old as A before 10 years. When A is 20…
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A is 14 years old and B was thrice as old as A before 10 years. When A is 20 years, how old will B be ?
- A.
22
- B.
30
- C.
24
- D.
28
Attempted by 18 students.
Show answer & explanation
Correct answer: D
Answer: 28
Ten years ago, A = 14 − 10 = 4 years.
At that time B was thrice A, so B = 3 × 4 = 12 years (ten years ago).
B's present age = 12 + 10 = 22 years.
When A is 20, that's 20 − 14 = 6 years from now, so B's age then = 22 + 6 = 28 years.
Therefore the correct answer is 28.