Four years ago, the average age of A and B was 18 years. At present the average age of A, B, and C is 24 years. What wou…

Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average…

A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must …

The average age of a cricket team of 11 players is the same as it was 3 years back because 3 of the players whose curren…

The average weight of first 11 persons among 12 persons is 95 kg. The weight of 12<sup>th</sup> person is 33…

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. Th…

Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56,…

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…