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

283 ÷25x4 + 186 = ? 

0.8% of a number is 31, then find the number.

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.

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: 

Two number 11284 and 7655, when divided by a certain number of three digits, leaves the same remainder. The sum of digits of such a three - digits number is: 

What should be added to to get the sum ?

What is the approximate value will come in place of the question mark(?) in the following questions?

The difference between the greatest and the least four-digit numbers that begins with 3 and ends with 5 is: