Question: A machine in a factory makes 2 1/4 pounds of nails in 1 1/2 hours. At what rate, in pounds per hour, does the machine make nails?
A) 2/3
B) 3/4
C) 1 1/2
D) 3 3/4
Correct answer: C
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.1