Final answer:
Stefan pours 1⅓ ounces of strawberry syrup on each of the three sundaes by dividing the total 5 ounces of syrup equally.
Step-by-step explanation:
Stefan had 5 ounces of strawberry syrup that he decided to split equally among three sundaes - one for himself and one for each of his two cousins. To find out how much syrup goes on each sundae, we need to divide the total amount of syrup by the number of sundaes.
Total syrup = 5 ounces
Number of sundaes = 3
Amount of syrup per sundae = Total syrup ÷ Number of sundaes
5 ounces ÷ 3 sundaes = 1⅓ ounces per sundae.
Therefore, Stefan pours 1⅓ ounces of strawberry syrup on each sundae.