Yesterday my mother asked me to buy some stamps. Stamps, are available in 3p, 9p, 11p, 17p and 21p denominations. For three types of stamp I was asked to buy eight of each. For the other two types of stamp, I was asked to buy nine of each. Unfortunately I forgot which I was supposed to buy eight of and which to buy nine of. Luckily my mother had given me the exact money required to buy the stamps, ã5.00 and the shopkeeper was able to give me the correct stamps. Which stamps did I buy?
Eight lots of 11p, 17p and 21p and nine lots of 3p and 9p. The shopkeeper rightly figured that I required eight lots of each of the stamps, which came to ã4.88, he also knew I required two more stamps which added up to the difference. QED.
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