Question

Present age of a grandfather is 72 years, while his grandson's age is 12 years. After 8 years, what would be the ratio of grandfather's age to grandson's age?

• A. 6 : 1
• B. 5 : 1
• C. 4 : 1
• D. 9 : 1

Answer 1

The correct option is C 4 : 1

Grandfather's present age is 72 years.
Grandson's present age is 12 years.

After 8 years,
grandfather's age would be 72 + 8 = 80 years
and grandson's age would be 12 + 8 = 20 years.

So, after 8 years, the ratio of grandfather's age to grandson's age would be $\frac{80}{20}=\frac{4}{1}=4:1.$