Yesterday I was asked to buy some stamps.
Stamps, in the land of BrainBashers, are available in 2p, 7p, 10p, 15p and 20p denominations.
For three types of stamp, I was asked to buy five of each.
For the other two types of stamps, I was asked to buy six of each.
Unfortunately, I forgot which I was supposed to buy five of and which to buy six of.
Luckily I had been given the exact money required to buy the stamps, £3.00 and the shopkeeper was able to give me the correct stamps.
Which stamps did I buy?
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Answer
Five lots of 2p, 7p and 15p and six lots of 10p, and 20p.
The shopkeeper rightly figured that I required five lots of each of the stamps, which came to £2.70.
The shopkeeper also knew that I required two more stamps which added up to the difference.
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