Multiple choice

The total number of chairs is between 80 and 120. If you put 8 chairs in a group, there are 4 left. If the total number of chairs is divisible by 9 and 12, how many chairs are there?

  1. 12

  2. 18

  3. 108

  4. 120
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

assume the number of chairs is x. So 80 < x < 120 and x is a common multiple of 9 and 12. The least common multiple of 9 and 12 is 36, so the common multiple of 9 and 12 between 80 and 120 can only be 36*3 = 108. 

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