Bicycle gears

The toothed wheel on the bicycle pedal has 40 teeth, and the wheel on the rear wheel has only 16 teeth. How many times does the rear wheel turn if the pedals rotate 50 times?

Correct answer:

n =  125

Step-by-step explanation:

n·16 = 50·40

16n = 2000

n = 2000/16 = 125

n = 125

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