What value will come in place of question mark (?) in the questions given below?

(4425÷25) ×(8.5×16) = ?

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

11283 + 25 % of ? + 727 = 13280 

The arithmetic mean of the following data is .

23, 17,20,19,21

The average of some natural numbers is 15. If 30 is added to first number and 5 is subtracted from the last number, the average become 17.5. then the numbers of natural numbers is :

The product of two consecutive odd numbers is 399. Find the lower of them.

What is the quotient , when 2645 is divided by 48 ? 

The average of five consecutive number is 26, then the multiple of the first and the last number is