Question

What least number should be placed instead of $*$in $31075*2$ so that the given number can be exactly divisible by $9?$

Answer 1

As we know that sum of all digits of numbers is divisible by $9$ then number is also divisible by $9$.

Sum of all digits of $31075*2$ is $3+1+0+7+5+*+2=18+*$

Since in $18+*$, $18$is divisible by $9$.

Hence, least number $0$ should be placed instead of $*$ in $31075*2$ so that the given number can be exactly divisible by $9$.