A grandparent is 70 and a grandchild is 26 today. How old was the grandchild when the grandparent was 50?

Question: A grandparent is 70 and a grandchild is 26 today. How old was the grandchild when the grandparent was 50?

1. 7 years
2. 5 years
3. 8 years
4. 6 years

Correct Answer: D — 6 years

Explanation: Ages change by the same number of years; subtract the years needed for the elder to reach 50.
Grandchild then = 26 − (70 − 50) = 6 years.