# SOLUTION: The average age of three boys is 25 years and their ages are in the proportion 3:5:7.The age of the youngest boy is a)21 b)18 c)15 d)9

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 Click here to see ALL problems on Proportions Question 138336: The average age of three boys is 25 years and their ages are in the proportion 3:5:7.The age of the youngest boy is a)21 b)18 c)15 d)9 Answer by checkley77(12569)   (Show Source): You can put this solution on YOUR website!3:5:7 3*25=75 total age of the 3 boys. 3+5+7=15 75/15=5 multiplier for each of the factors 3,5 & 7 3*5=3*5=15 age of the youngest boy.