Question:

Karl, Tanya and Noah got one loaf of bread that they cut up into 12 pieces. Karl ate 5/12 pieces of the bread, Tanya ate 3/12 pieces of the bread and Noah ate 3/12 pieces of the bread.

How much of the bread was left over?

Solution:

5/12+3/12+3/12=  11/12

There was one piece of bread left over.