Question

Find the value of X, if 1245X42 is divisible by 11.

• A. 0
• B. 4
• C. 5
• D. 9

Answer 1

Answer:

B. 4

We know that, for a number to be divisible by 11, the difference between the sum of digits in odd places and the sum of digits in even places should be either 0 or a number divisible by 11. (1+4+X+2) – (2+5+4) = 0 or multiple of 11 X – 4 = 0 Therefore, X = 4.