A machine, working at a constant rate, manufactures 36 staplers in 28 minutes. How many staplers does it make in 1 hr 45 min?
A. 125
B. 128
C. 135
D. 144
E. 150
Answer: C
Source: Magoosh
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A machine, working at a constant rate, manufactures 36 staplers in 28 minutes. How many staplers does it make in 1 hr 45
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Solution:
We can set up the following proportion, where x is the number of staplers the machine can produce in 1 hr 45 min, or 105 minutes:
36/28 = x/105
9/7 = x/105
7x = 945
x = 135
Answer: C
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