There are 50 students in a class. In a class test 22 students get 25 marks each, 18 students get 30 marks each. Each of the remaining gets 16 marks. The average mark of the whole class is :

A bank compounds interest half yearly. Raju deposits Rs.25,000 in the bank at a rate of 8%. The total interest at the end of one year is?

In trial average method, the average of 20 numbers is assumed to be 24. The sum of deviations of the numbers from 24 is found to be 15. What is the average?

An amount becomes Rs.11,300 in 2 years and Rs.12,600 in 4 years. The rate, if calculated at simple interest is :

If the number 3 5 7 x 4 is divisible by 6, then value of x is :