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Teaching Math in 1950: A logger sells a truckload of lumber for $100. His cost of production is 4/5 of the price. What is his profit?
Teaching Math in 1960: A logger sells a truckload of lumber for $100. His cost of production is 4/5 of the price, or $80. What is his profit?
Teaching Math in 1970: A logger exchanges a set of lumber (L) for a set of money (M). Make 100 dots representing the elements of the set M. The set C, the cost of production, contains 20 fewer dots than M. Represent C as a subset of M and answer: What is the cardinality of the set P, profits?
Teaching Math in 1980: A logger sells a truckload of lumber for $100. His cost of production ...
Source: HighBeam Research, Progress? (Scan).(humor about math education)(Brief Article)