Question

21y5 in
this number is
in this number find the value of y.
divisible by 3.​

Answer 1

Answer:We know that the sum of the digits of the number should be divisible by 3 so that the number is divisible by 3.

Therefore 2+1+y+5 should be divisible by 3.

If y = 1

2+1+(1)+5 = 9 , which is divisible by 3.

If y = 4

2+1+(4)+5 = 12 , which is also divisible by 3.

If y = 7

2+1+(7)+5 = 15 , which is also divisible by 3.

Hence the value of y is either 1 or 4 or 7.

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