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 …

Visitor to a show were charged Rs. 15 each on the first day, Rs. 7.50 each on the second day and Rs. 2.50 each on the th…

If the average of x and $$\frac{1}{x}$$ (x $$ \ne $$ 0) is M, then the average of x<sup>2</sup> and $$\frac…

The arithmetic mean of the series 1, 2, 4, 8, 16, . . . . . . , 2<sup>n</sup> is -

A student finds the average of 10, 2 digits numbers. If the digits of one of the numbers interchanged, the average incre…

The average of a non-zero number and its square is 5 times the number. The number is-

The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years j…

Out of 10 teachers of a school, one teacher retires and in place of him a new teacher 25 years old joins. As a result of…