A gear 12 cm in diameter is turning a gear 18 when the smaller gear has 42 revolution how many revolution has the larger one made
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small gear covers 2π6 circumference and bigger 2π9 so 2π6/2π9=2/3 means upon 3 rotation of small gear only 2 rotation of big gear.
so (3*14)42 rotation of small gear, big gear rotates 2*14=28 rotations.
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