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Ratios & Proportions

The Crayola crayon company can make 2400 crayons in 4 minutes. How many crayons can they make in 15 minutes? Set up a proportion and solve for n.
The Crayola crayon company can make 9000 crayons in 15 minutes. A typist can type 120 words in 100 seconds. At that rate, how many seconds would it take her to type 258 words? Set up a proportion and solve for n.
It would take her 215 seconds to type 258 words. 