Answer:
4 : 5
Explanation:
We are told that 20 students saw the movie and 5 didn't, meaning there were in total 20 + 5 = 25 students; therefore, the ratio is
[tex]\frac{\text{saw the movie}}{\text{total students}}=\frac{20}{25}[/tex]To simplify the ratio, we divide both the numerator and the denominator by 5. This gives
[tex]\frac{20\div5}{25\div5}[/tex][tex]\frac{4}{5}[/tex]Hence, the ratio of the students who saw the movie to the total number is 4 : 5.
