Cathy made 25 cupcakes for the friends at her party. If only 4/5 of her friends showed up, how many cupcakes does she have left?

1/5 of 25 is...

4 or 16

To find out how many cupcakes Cathy has left, you first need to determine the number of friends who showed up at her party. To do this, you multiply the number of friends Cathy invited by the fraction that represents the turnout rate (4/5).

Number of friends who showed up = Number of friends invited × Turnout rate

In this case, Cathy invited her friends, and the turnout rate is 4/5. Multiplying these together gives us:

Number of friends who showed up = 25 × 4/5

To multiply fractions, you simply multiply the numerators (4) together and the denominators (5) together:

Number of friends who showed up = (25 × 4) / 5

Simplifying the numerator:

Number of friends who showed up = 100 / 5

Dividing 100 by 5, we find that 100 divided by 5 equals 20:

Number of friends who showed up = 20

Now that we know 20 friends showed up, we can calculate the number of cupcakes Cathy has left. To do this, we subtract the number of friends who showed up from the original number of cupcakes she made.

Number of cupcakes left = Number of cupcakes made − Number of friends who showed up

Number of cupcakes left = 25 − 20

Subtracting 20 from 25, we find that 25 minus 20 equals 5. Therefore, Cathy has 5 cupcakes left.