If 31×4 is a multiple of 3 where x is digit, what might be the value of x?​

1 thought on “If 31×4 is a multiple of 3 where x is digit, what might be the value of x?​”

1. Step-by-step explanation:

   3 1 _ 4

   There is simple technique to solve like these problems.

   That is :

   3 + 1 + 4 = 8

   8 is not divisible by 3

   If we add 1 in the place of x

   That is 3 1 1 4

   3114 is divisible by 3

   3114 ÷ 3 = 1038

   ∴ value of x is 1

   This simple technique applies to all, excluding for the multiples of 5 and 10.

   For the multiples of 5, the last digit of the number should be 5 or 0.

   For the multiples of 10, the last digit of the number should be 0.

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