Collection of six coins
Assume that we have a collection of six coins, exactly one of which is counterfeit and weighs less than each authentic coin. Use a decision tree to describe a method for identifying the counterfeit coin using two weighings of a balance scale.
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A plane flies 465 miles with the wind and 345 miles against wind in the same length of time. If the speed of the wind is 20 mph find the speen of the plane in still air.
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