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step-by-step explanation:
7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.
23/3 * 15/2 = 57 1/2
9 sandwiches per hour
when we have a rate, we want a 1 in the denominator
27/3 = 9
27 sandwiches/ 3 hours = 9 sandwiches/hour
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