Thrice the square of a natural number decreased by four times the number is equal to 50 more than the number. The 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 sum of five consecutive even numbers of set A is 280. What is the sum of different set of five consecutive numbers whose lowest number is 71 less than double the lowest number of set A?

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

If $${17}^{200}$$ is divided by 18, the remainder is:

The smallest number of five digits exactly divisible by 476

In how many ways can a committee schedule three speakers for three different meetings if they are all available on any of five possible dates?

$$(49)^{15}-1$$ is exactly divisible by :