Final answer:
Mr. Hooper can wrap 3 gifts with 15 cm of ribbon.
Step-by-step explanation:
To calculate how many gifts Mr. Hooper can wrap with 15 cm of ribbon, we need to determine how much ribbon is used per gift.
Since Mr. Hooper used 15 cm to wrap three gifts, we can divide 15 cm by 3 to find the amount of ribbon used per gift.
This gives us 5 cm per gift.
Therefore, with 15 cm of ribbon, Mr. Hooper can wrap a total of 3 gifts.