General Basic Math Exams Quizzes MCQs Quizzes Ratio and Proportion Math Quiz

Question:
The average age of three boys is 25 years and their ages are in the proportion 3: 5 : 7. The age of the youngest boy is:

Option A):
9 years
Option B):
21 years
Option C):
15 years
Option D):
18 years

Correct Answer is Option C):
15 years

Explanation:
Solution:
Total age of boys (25 X 3) years = 75 years
Age of the youngest = (75 X 3/15) = 15 years