Question 51
The average age of 3 persons is 30 years.If their ages are in the ratio of 3:5:7 respectively, then the age ofthe eldest person is:
Solution
Given average age of three persons =30 years
Sum of the ages of three people=90 years
let the ages of three people be 3x,5x and 12x.
sum=3x+5x+7x
=15x
15x=90
x=6
Age of eldest person=7*6
=42 years
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