Question

what least number should be added to 5135 to make divisible by 3?

Answer 1

divisible by 3 if sum of digits divisible by 3
let least number be x
number becomes 5135x
sum = 5+1+3+5+x
sum=14+x
let x=1,
14+1=15 divisible by 3
therefore least number is 1 is answer
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