For what value of digit x, is :31×5 divisible by 3 ? – InterviewSolution

1.

For what value of digit x, is :31×5 divisible by 3 ?

Answer»

31×5 is divisible by 3

=> 3 + 1 + x + 5 is a multiple of 3

=> 9 + x = 0, 3, 6, 9,

=> x = -9, -6, -3, 0, 3, 6, 9,

Since, x is a digit

x = 0, 3, 6 or 9

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