Answer:
1/4
Explanation:
2/4 + 1/4 = 3/4.
4/4 - 3/4 = 1/4
1/4 of the sandwich
If you add 1/4 + 2/4 you get 3/4
Since you are finding how much is left, if 3/4 of the sandwich was eaten, you have 1/4 left
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