Question

Find the least number. which on adding15 is exactly divisible by 25,30,40,45

Answer 1

The answer is 30 and 45.

Answer 2

The LCM of all the numbers that is equal to 25, 30,40, 45 is

                   5 x 3 x 2 x 5 x 1 x 4 x 3 = 1800

 So 1785 + 15 = 1800

Now all the numbers are divisible 1800 / 25 = 72, 1800 / 30 = 60, 1800 / 40 = 45 and 1800 / 45 = 40.