Question

the sum of all natural numbers from 100 to 300 which are exactly divisible by 4 and 5​

Answer 1

the natural numbers and divisible by 4 and 5

Answer 2

The required numbers should be divisible by 20 in order to be divisible by both 4 and 5. The numbers are:

100, 120, 140, 160, 180, ..., 300

So, the sum of all such upto 300 numbers = 10/2 × 380 + 300 = 1900 + 300 = 2200

HOPE THIS COULD HELP!!!