Postal or Sorting Assistants Model Paper 6 With Solutions

Question : 22 of 100

Marks: +1, -0

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

Solution:

(a) Let the ages of three boys are 3x, 5x and 7x.
Average age

={3x+5x+7x}/3

25 x 3 = 15x

x = 5
The age of youngest boy =15 yrs.

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