If the average temperature of first four days of the week was 39°C and the average temperature of the week was 40&de…

In a set of three numbers, the average of first two numbers is 2, the average of the last two numbers is 3, and the aver…

The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is :

If average of 20 observations x<sub>1</sub>, x<sub>2</sub>, . . . . . x<sub>20</sub>…

The average expenditure of a man for the first five months is Rs. 1200 and for the next seven months is Rs. 1300. If he …

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

Nine persons went to a hotel for taking their meals. Eight of them spent Rs.12 each on their meals and the ninth spent R…

The average weight of five persons sitting in a boat is 38 kg. The average weight of the boat and the persons sitting in…