The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two b…

Out of 9 persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expendit…

The average age of a husband and wife at the time of their marriage was 25 years. A son was born to them two years after…

A student finds the average of ten 2 digits numbers. While copying numbers, by mistake, he writes in number with its dig…

The average price of 10 books is Rs.12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two bo…

30 pens and 75 pencils altogether were purchased for Rs. 510. If the average price of a pencil was Rs. 2, what was the a…

In a boat there are 8 men whose average weight is increased by 1 kg when 1 man of 60 kg is replaced by a new man. What i…

The mean weight of 100 students in a class is 46 kg. The mean weight of boys is 50 and of girls is 40 kg. Therefore, the…