Bicycle gear

The pedal bicycle wheel has 56 teeth and a rear 20 gear tooth. How many times does the bicycle wheel turn when you make 20 turns of the pedal wheel?

Correct result:

n =  56

Solution:

$$\begin{gathered} s_1=s_2 \\ 56\cdot 20=20\cdot n \\ n=20\cdot {\displaystyle \frac{56}{20}}=56 \end{gathered}$$

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