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Hot potato

Recently found on an Ayrshire staffroom wall, headed: "The Evolution of Mathematics Education".

1960s: A peasant sells a bag of potatoes for Pounds 10. His costs amount to three-fifths of his selling price. What is his profit?

1970s: A farmer sells a bag of potatoes which he has produced for Pounds 6 i.e. three-fifths of his eventual selling price. What is his profit?

1970s (New Maths): A farmer exchanges a set of P potatoes with a set M of money. The cardinality of the set M is equal to Pounds 10, and each element of M is worth Pounds 1. Draw 10 big dots representing elements of M. The set C of product costs is comprised of 4 big dots less than the set M. Represent C as a subject of M and give the answer to the question: what is the cardinality of the set of profits?

1980s: A farmer sells a bag of potatoes for Pounds 10. His product costs are Pounds 6 and his profit is Pounds 4. Underline the word "potatoes" and discuss with your classmates.

1990s: A kapitalist pig unfjustlee akuires Pounds 4 on a sak of potatoze. Analiz this tekst and serch for erors in speling, gamar and punktuashon, and then expres your views regarding this method of geting ritch.

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