20 x 3 is a multiple of 3,

Question:

 20 x 3 is a multiple of 3, if the digit x is——–or——— or————.

Solution:

1,4,7

We know that, if a number is a multiple of 3, then the sum of its digits is again a multiple of 3, i.e. 2+0+x+3 is a multiple of 3.

x + 5 = 0, 3, 6, 9, 12, 15 But, x is a digit of the number 20 x 3.

x can take values 0, 1,2, 3,……..9.

=> x + 5 = 6 or 9 or 12

Hence, x = 1 or4 or 7

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