Direction : What should come in place of the question (?) in the following question.

√(?) + 15² = 235

The students of a class donated Rs. 3, 481 towards relief fund. Each student donated an amount qual to the number of students in the class. The number of students in the class is: 

A is inversely proportional to square of B whereas directly proportional to C. Value of A was 27 when value of B was 4 and value of C was 6. Find the value of A when value of B will be 3 and value of C will be 8.

If 40% of a number is equal to 3 / 5th of another number, what will be the ratio of the first number and the second number?

The sum of four numbers is 64. If we add 3 to the first number, 3 is subtracted from the second number, the third is multiplied by 3 and the fourth is divided by 3, then all the results are equal. What is the difference between the largest and the smallest of the original number?

Direction : What value should come in the place of question mark (?) in the following questions?

283 ÷25x4 + 186 = ? 

What should be added to to get the sum ?

The least number that must be subtracted from 1294 so that the remaining number when divided by 9, 11, 13 will leave in each case the same remainder 6 is: