Quantitative Aptitude :: Problems on Ages - Discussion

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Explanation:
As per Formula:
(If the given ages in a ratio a : b then age will be ax and bx)

so persons age will be 2x, 4x and 6x respectively.

Their age average is 60
so (2x+4x+6x)/3 = 60
=> 12x = 60 * 3
=> x = 180/12 = 15

so age of youngest is 30 years.