Allison used 2.5 half cups of flour to make a cake, and 3 over 4of a cup of flour to make a pie. If she started with 4 cups of flour, how many cups of flour does she have left?

Answer: Allison has 3/4 cups of flour left.

Step-by-step explanation:

Allison used flour twice, the first time she used 2.5 cups of flour, and the second time she used 3/4 cups of flour. Let's convert these two the the same unit.

2.5 = 2 1/2 or 5/2

Let's make this have the same base so it will be easier to add 3/4 to it.

5/2=10/4

We know she used both of these amounts of flour so let's add them. 10/4+3/4=13/4

We know she used 13/4 cups of flour. Let's convert 4 cups of flour to have the denominator of 4.

4=16/4

Now, we just have to subtract how much flour she used to make the pie and cake.

16/4-13/4=3/4

Allison has 3/4 cups of flour left.