1/3 + 1/4 + 1/5 + 1/6
20/60 + 15/60 + 12/60 + 10/60
57/60
3/60x = 9
3x = 9(60)
x = 180
Answer is D
20/60 + 15/60 + 12/60 + 10/60
57/60
3/60x = 9
3x = 9(60)
x = 180
Answer is D
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