There are some muffins in a box. The muffins can be put into plates of 4 or 12 with no muffins leftover. When the muffins are put into plates of 14, there are short of 4 muffins on the last plate. If there are more than 20 muffins but less than 40 muffins, how many muffins are there in the box?
If muffins can be put into plates of 4 or 12 with no muffins leftover, the number of muffins is a multiple of 12 as 12 is a multiple of 4.

Multiples of 12 that are greater than 20 but less than 40: 24, 36

Multiples of 14 that are greater than 20 but less than 40: 28
Multiples of 14 (- 4) that are greater than 20 but less than 40: 24

Common number = 24

Number of muffins = 24

Answer(s): 24