Mike cut 2 acres of grass in 30 minutes on his tractor. Which proportion would determine how many ac

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Mike cut 2 acres of grass in 30 minutes on his tractor. Which proportion would determine how many acres of grass Mike cut in 60 minutes?

Let a be the number of acres of grass cut by Mike in 60 minutes. We have the following proportion:
2/30 = a/60

Typing this problem into our search engine, we get a = 4.