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### Question

x should be replaced by which minimum number so that 39x5425441 is completely divisible by 9?

**A**

8.

**B**

9.

**C**

7.

**D**

10.

**Soln.**

**Ans: a**

If the above number has to be divisible by 9, the sum of the digits, i.e., 3 + 9 + x + 5 + 4 + 2 + 5 + 4 + 4 + 1, should be divisible by 9. So we can see that $x + 37$ should be divisible by 9. By inspection, x = 8.