To find the ratio of olives to pepperonis, we need to compare the number of olives to the number of pepperonis.
Francis is using:
- 20 olives (from 1 can)
- 25 pepperonis (from 1 package)
The ratio of olives to pepperonis can be written as:
\[ \text{Ratio of olives to pepperonis} = \frac{20 \text{ olives}}{25 \text{ pepperonis}} \]
This can be simplified by dividing both the numerator and the denominator by 5:
\[ \frac{20 \div 5}{25 \div 5} = \frac{4}{5} \]
Therefore, the ratio of olives to pepperonis is 4:5.