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

11283 + 25 % of ? + 727 = 13280 

Two numbers are respectively 30% and 40% less than a third number. What percent is the first number of the second?

Find the difference between mean and median in the given data 2.5, 4.6, 7.2, 3.3, 4.9, 5.6, 2.7?

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

$$2\over7$$ of $$ 5\over6$$ of ?=200

Twice the difference between two numbers is equal to their sum. If one number is 15, find the other number.

The largest natural number which exactly divides the product of any four consecutive natural numbers is

The least number, which must be added to 6709 to make it exactly divisible by 9, is 

When a number is increased by 28, it becomes 107% of itself. What is the number?