Three siblings are each 2 years apart in age and together are 63 years old. What is the middle sibling’s age?

Question: Three siblings are each 2 years apart in age and together are 63 years old. What is the middle sibling’s age?

1. 22 years
2. 20 years
3. 21 years
4. 23 years

Correct Answer: C — 21 years

Explanation: Equally spaced ages have their middle age equal to one-third of the total.
Middle age = 63 ÷ 3 = 21 years; the gap is 2 years.