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Question 11
The average age of three friends is 20 years and their ages are in the proportion 2:3:5, the age of the oldest friend is :
Solution
Given average age of three friends is 20 years
Sum of their ages = $$3\times\ 20$$ = 60 years
Given, their ages are in ratio 2:3:5. Let their ages be 2x, 3x and 5x
2x + 3x + 5x = 60
10x = 60
x = 6
Their ages are 12 years, 18 years and 30 years
Age of oldest friend = 30 years
Answer is option C.
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