Average age of all students in a class is 16 years. Out of which 40% are boys and the ratio of the average age of all girls to that of all boys is 6: 7. If there are fifty students in the class, then find the average age of all the boys.
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Answer:
Let No of boys = No of girls = x
Avg age of whole class =
x+x
16×x+15×x
=
2
16+15
=15.5 years
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