When two gears are mashed the revolution per minutes (rpm) are inversely proportional to the number of teeth, as show below. In one machine the rpm ratio of the larger gear to the small gear is 4:7 The small gear has 216 teeth In second machine the larger gear revolves at 400 rpm and has 315 teeth. The smaller gear revolves at 700 rpm.
Find the number of teeth on the larger gear of the first machine?
Find the number of teeth on the small gear of the first machine?
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