Question

Find the least number, exactly divisible
by 21, 25, 90 when we
add 4 to it.

Answer 1

Given:-

Find the least number, exactly divisible by 21, 25, 90 when we add 4 to it.

To Find:-

We should have to add 4 to the given numbers and then we should divide...

Solution:-

• 21

⇒ 21 + 4 = 25.

• 25 ÷ 2 = (N.P)

• 25 ÷ 3 = (N.P)

• 25 ÷ 4 = (N.P)

• 25 ÷ 5 = 5

∴ Hence, 25 is divisible by 5.

$\:$

• 25

⇒ 25 + 4 = 29.

• 29 ÷ 2 = (N.P)

• 29 ÷ 3 = 13.

∴ Hence, 29 is divisible by 3.

$\:$

• 90

⇒ 90 + 4 = 94.

• 94 ÷ 2 = 47

∴ Hence, 94 is divisible by 2.

25 is divisible by 5, 29 is divisible by 3 and 94 is divisible by 2.