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 :

A company produces 18% more machines than of the previous year. If their production in the current year is 17700 machines, the production last year is :

In a class of 50 students, 32 students passed in English and 38 students passed in Mathematics. If 20 students passed in both the subjects, the number of students who passed neither English nor Mathematics is :