The average age of 3 boys is 15 years. Their ages are in the ratio of 3:5:7. If so the age of the youngest boy is??
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15x/3 =15
=5x=15
x=3
the youngest boy is 3x
3*3=9
=5x=15
x=3
the youngest boy is 3x
3*3=9
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youngest boy is 9 years old
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