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Irma thought about how many times she could fill different size measuring cups.
I would fill a 
-cup measure one time to measure of a cup.
I would fill a 
-cup measure 3 times to measure of a cup of sugar.
I must fill a 
-cup twice as many times, because it takes two -cup measures to fill cup.
So, I will need to fill the -cup six times to measure of a cup of sugar.