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### Question

x should be replaced by which minimum number so that 36318x5944 is completely divisible by 9?

**A**

2.

**B**

3.

**C**

5.

**D**

4.

**Soln.**

**Ans: a**

If the above number has to be divisible by 9, the sum of the digits, i.e., 3 + 6 + 3 + 1 + 8 + x + 5 + 9 + 4 + 4, should be divisible by 9. So we can see that $x + 43$ should be divisible by 9. By inspection, x = 2.