Question

Find A in 3A7 if it is diviable by 3​

Answer 1

Answer:

A can be 2, 5 or 8 so that 3A7 is divisible by 3.

Answer 2

Answer:

A number is divisible by 3 if the sum of its digits is divisible by 3.

Sum of the digits = 3+A+7 = 10 + A

SO 10 +A is divisible by 3

So A may be 2, 5,8

If A = 2, 8

Then 3A7 is not divisible by 3

So A = 5

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