In the cafeteria,100 milk cartons were put out for breakfast. At the end of breakfast,27 remained.

73:27

I didn't see a question, but your response seems like a reasonable answer.

60:100

To find out how many milk cartons were consumed during breakfast, you can subtract the number of remaining cartons from the initial number of cartons.

The calculation would be:
Initial Number of Cartons - Remaining Cartons = Consumed Cartons

In this case:
100 - 27 = 73

So, 73 milk cartons were consumed during breakfast in the cafeteria.