Question

Find the least number which should replace * in the number 89 * 2 to make it exactly divisible by : 3

Answer 1

* should replaced with 2 as the the divisibility theorem for 3 says that to check a no divisible by 3 is to count the sum of digits in the no and if the sum is divisible by 3 then the no can be divisible by 3 so the closest sum could be made was 21 and it could be made by adding 2 to the number