Ann works 51/2 hours, Mary works 61/3 hours, and John works 41/4 hours. How many combined hours have they worked?
A. 165/12
B. 155/12
C. 151/12
D. 161/12

Ann works 51/2 hours, Mary works 61/3 hours, and John works 41/4 hours. How many combined hours have they worked?
A. 165/12
B. 155/12
C. 151/12
D. 161/12

The answer is B. 161/12.
61/3 is 66 twelfths, 6/13 is 76 twelfths, 41/4 is 51 twelfths = 193 twelfths = 161/12.

Ann works 51/2 hours, Mary works 61/3 hours, and John works 41/4 hours. How many combined hours have they worked? A. 165/12 B. 155/12 C. 151/12 D. 161/12

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