1, 3, 5, 7, ………total average of 25^th number  is:

If * means adding 6 times the second number to the first number then ( 1 * 2 ) *   3 equals : 

What should be added to $$ {10 \ over 11} $$ to get the sum $$ {11 \ over 10} $$?

While solving a problem, by mistake, Anita squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the right answer. What was the given number? 

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: 

4⁶¹ + 4⁶² + 4⁶³ + 4⁶⁴ is divisible by: 

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.

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