Scott bought a large bag of cookies at the bakery. He ate 3 7 of a bag and his sister ate 1 4 of a bag. What fraction of the bag did they eat?

Question

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Answer 1

The wording is not clear, but I will assume you meant to say that Scott ate 3/7 of the bag and his sister ate 1/4 of the bag.  Then the total fraction that they ate is

 

3/7 + 1/4 = 12/28 + 7/28 = (12 + 7)/28 = 19/28