Answer:
Kaylee spent 11/12 hours studying longer than Abby.
Explanation:
First, make the denominators the same (meaning we multiply):
4 1/4 = 5/4*3 = 15/12
2 1/6 = 13/6*2 = 26/12
Then, we subtract:
26/12 - 15/12 = 11/12
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