we have the following:
in this case we must find the largest divisor between the numbers 12 and 20, this number is 4:
[tex]\begin{gathered} \frac{12}{4}=3 \\ \frac{20}{4}=5 \end{gathered}[/tex]Therefore 3 flyers for the science club and 5 flyers for the music club. And it would be 4 places
