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


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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 :

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

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

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 :

Averages Aptitude Questions

Arithmetic-Aptitude