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

1798 ÷ 31 × ? = 348

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.

4/5 of a number is 10 more than two-thirds of the same number. What is that number?

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

Direction: What is the approximate value will come in place of the question mark(?) in the following questions?
5682 ÷ 63 × 36=? ×19

The arithmetic mean of the following data is .

23, 17,20,19,21

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