The average age of three persons is 30 years. If the ratio of three ages is 3 : 5 : 7, what is the age of the youngest person ?

The average age of three persons is 30 years. If the ratio of three ages is 3 : 5 : 7, what is the age of the youngest person ? Correct Answer 18 years

Total age of them = 30 x 3 = 90 years. Sum of the ratios = 3 + 5 + 7 = 15 So, the age of the youngest person = 3 / 15 x 90 = 18 years
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