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The average age of 30 boys in a class in 15 years. One boy, aged 20 years, left class, but two new boys came in his place whose age differs by 5 years. If average age of all boys now in class becomes 15 years, age of younger newcomer is :


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Average of n numbers is a. The first number is increased by 2, second one is increased by 4, the third one is increased by 8 and so on. The average of the new numbers is -

The average age of 30 boys in a class in 15 years. One boy, aged 20 years, left class, but two new boys came in his place whose age differs by 5 years. If average age of all boys now in class becomes 15 years, age of younger newcomer is :

The average of 8 numbers is 20. The average of first two numbers is $$15\frac{1}{2}$$ and that of the next three is $$21\frac{1}{3}$$ . If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, them the eighth number is :

The average age of 30 boys in a class in 15 years. One boy

aged 20 years

left the class

but two new boys came in his place whose age differs by 5 years. If the average age of all the boys now in the class becomes 15 years

the age of the younger newcomer is :

Averages Aptitude Questions

Arithmetic-Aptitude