Question

How many three - digit natural numbers are divisible by 7?

Answer 1

All the three-digit natural numbers that are divisible by 7 will be of the form 7n.

Therefore, $100\le 7n\le 999\Rightarrow 14\frac{2}{7}\le n\le 142\frac{5}{7}$

Since, n is an integer, therefore, there will be 142 - 14 = 128 three-digit natural numbers that will be divisible by 7.

Therefore, there will be 128 three - digit natural numbers that will be divisible by 7.