Question

If 345A 7 is divisible by3 supply the missing digit in place of Ao

Answer 1

If it is a multiple of 3 then the sum of digits should be multiple of three is the rule so 3+4+5+7+A=3x

so 19+A should be multiple of 3

so A can be 2,5,8

Answer 2

$345a7 \div 3 = 34527 \div 3 \\ \: \: \: \: \: \: \: \: \: \: = 1159$

a=2