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>> The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in...
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Q. The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?
a.
15
b.
9
c.
18
d.
21
ANSWER: 9
Answer & Explanation
3x + 5x + 7x = 45
x =3
3x = 9
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