Multiple choice

If the number 5x311 is divisible by 9 then what is the value of x

  1. 2

  2. 5

  3. 7

  4. 8
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A number is divisible by 9 if the sum of its digits is divisible by 9. The sum of digits of 5x311 is 5+x+3+1+1 = 10+x. For 10+x to be divisible by 9, x must be 8 (18 is divisible by 9).

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