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To find the rate at which Uriel crushes aluminum cans, we need to set up a proportion based on the information given.
3 cans / (2/3) minutes = x cans / 1 minute
Now we can solve for x by multiplying both sides by 3/2.
3 cans / (2/3) minutes * 3/2 = x cans / 1 minute
x = 3 cans * 3/2 / 2 = 9/2 = 4 1/2
Therefore, the rate at which Uriel crushes aluminum cans is 4 1/2 cans per minute.
The answer is C. 4 1/2.