How do you solve 3 1/4+4 1/2-11/2

Lisa baked 3 1/4 dozen cookies for a bake sale. Her friend Nina baked 4 1/2 dozen cookies for the bak sale. Nina and her two brother ate 11/2 dozen of the cookies she baked.  How many dozen cookies did Lisa and Nina donate to the bake sale?
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1 Answer

3 1/4 + 4 1/2 - 11/2

13/4 + 9/2

=13/4 + 18/4 

=31/4 - 11/2

31/4 - 22/4

= 9/4 or 2 1/4

by Level 3 User (2.5k points)

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