Question

If 21x5 is divisible by 3find x

Answer 1

Answer:

Least value of x = 1

Step-by-step explanation:

Id a number is divisible by 3, then the sum of its digits must be a multiple of 3.

So, 2 + 1 + x + 5 = multiple of 3

8 + x = multiple of 3

Nearest multiple of 3 = 9

So, x = 9 - 8 = 1