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- The average age of three boys is 15 years and their ages are in proportion 3:5:7.
Question 1:
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
Feedback 3x + 5x + 7x = 45
x =3
3x = 9
x =3
3x = 9
C. 18
D. 21
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