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参考・概略です

ギア1(歯数60)→ギア2(歯数15)
10回転→10×(60/10)=60回転

ギア2(歯数15)→ギア3(歯数75)
60回転→60×(15/75)=12回転

ギア3(歯数75)→ギア4(歯数10)
12回転→12×(75/10)=30回転

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