Colin rides his bike 39 miles in 3 hours. if he rides at the same speed, how many miles can he ride in 5 hours? a) 15 miles b) 13 miles c) 65 miles d) 177 miles

What is the ratio if counted 14 robins out of 150

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There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y