Yesterday my mother asked me to buy some stamps. Stamps, in the land of TYM, are available in 3c, 9c, 11c, 17c and 21c 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, $5.00 and the shopkeeper was able to give me the correct stamps. Which stamps did I buy?
Eight lots of 11c, 17c and 21c and nine lots of 3c and 9c. The shopkeeper rightly figured that I required eight lots of each of the stamps, which came to $4.88, he also knew I required two more stamps which added up to the difference. QED.
© Kevin Stone: [www.brainbashers.com]
