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1.
Sipho's machine uses the two meshed spur gears shown. Gear P is the driver and has 28 teeth; gear Q is the driven gear and has 42 teeth. Calculate the gear ratio (also called the velocity ratio) of this gear system, using gear ratio = teeth on the driven gear ÷\div teeth on the driver gear. The answer works out exactly.
[3]
P28 teethQ42 teeth

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