Joelle ordered 12 dozen doughnuts for the honor roll breakfast at the middle school.
•
of the doughnuts have chocolate icing.
•
of the doughnuts have white icing with sprinkles.
•
of the doughnuts have pink icing.
• The rest are plain glazed doughnuts.
How many doughnuts are plain glazed doughnuts?
Since 12 dozen doughnuts is equal to 144 doughnuts, and we know that some have chocolate icing, some have white icing with sprinkles, and some have pink icing, we can subtract those from the total to find out how many doughnuts are plain glazed.
12 dozen doughnuts = 144 doughnuts
- Chocolate icing doughnuts = 1/4 of 144 = 36 doughnuts
- White icing with sprinkles doughnuts = 1/6 of 144 = 24 doughnuts
- Pink icing doughnuts = 1/9 of 144 = 16 doughnuts
36 + 24 + 16 = 76 doughnuts that are not plain glazed
Therefore, there are 144 - 76 = 68 plain glazed doughnuts.