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 …

Six tables and twelve chairs were bought for Rs. 7800. If the average price of a table is Rs. 750, then the average pric…

Of the three numbers, the average of the first and the second is greater than the average of the second and the third by…

The present age of a father is 3 years more than three times the age of his son. Three years hence, father's age will be…

The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct mean…

The mean monthly salary paid to graduating MBA class of a management institute is Rs. 16000. The mean monthly salary pai…

In an examination, a pupil’s average mark was 63 per paper. If he had obtained 20 more marks for his Geography pap…

The average weight of A, B and C is 40 kgs. Weight of C is 24 kgs more than A’s weight and 3 kgs less than B&rsquo…