Selasa, 26 April 2011

Puzzle 11
Which is larger, the number of seconds in a day or the number hours in 10 years?
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 [Ref: ZLCF] © Kevin Stone [Protected Puzzle]

Difficulty: Medium4 Star RatingPuzzle 12
Due to rumours that there was a world shortage of chewing gum, everyone was stocking up on packs. By the time I'd got to the store, they had sold out!

However, there were two people at the till who had bought 4 and 5 packs respectively and they kindly offered to share their packs with me. After the sharing, we all had the same number of packs each and I paid them $9 for my packs. How did they share the $9 between them?
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 [Ref: ZNBH] © Kevin Stone [Protected Puzzle]

Difficulty: Easy4 Star RatingPuzzle 13
I travelled from London to Glasgow last week at 60 miles per hour, I had filled my petrol tank just before I left, so it was full with 25 gallons. Unfortunately, my petrol tank sprang a leak immediately and I only managed to drive 300 miles before I ran out of petrol. My car does 30 miles per gallon, how fast was I losing petrol through the hole?
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 [Ref: ZFAU] © Kevin Stone [Protected Puzzle]

Difficulty: Medium4 Star RatingPuzzle 14
The island of Elbonia have a rather eccentric postal system. Postage for an item can be anything from 1 dinar to 15 dinari, and you must use exact postage. Frustratingly, there is only space on the envelopes in Elbonia to attach a maximum of three stamps. What is more, they only have three different denominations of stamps, can you work out what they are?
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 [Ref: ZSMS] © Paul Bostock and Elliott Line
This puzzle appeared in Mensa's EnigmaSig and is used with permission.


Difficulty: Medium4 Star RatingPuzzle 15
My local bus company has recently expanded and no longer has enough room for all of its buses. Twelve of their buses have to be stored outside. If they decide to increase their garage space by 40%, this will give them enough room for all of their current buses, plus enough room to store another twelve in the future. How many buses does the company currently own?
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 [Ref: ZWOL] © Kevin Stone [Protected Puzzle]
Puzzle 6
You have 12 coins, one of which is fake. The fake coin is indistinguishable from the rest except that it is either heavier or lighter, but you don't know which. Can you determine which is the fake coin and whether it is lighter or heavier using a balance scale and only 3 weighings?
?
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 [Ref: ZLKY]

Difficulty: Easy4 Star RatingPuzzle 7
Dodgy Dave did such a good job of the housing estate, he was asked to paint the room numbers on all of the doors of the fourth floor of the local hotel. He painted all of the numbers from 400 to 499. How many times did he paint the number 4?
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 [Ref: ZULZ] © Kevin Stone [Protected Puzzle]

Difficulty: Medium4 Star RatingPuzzle 8
Practical Peter was asked to cut a 99 foot rope into three smaller, equal length ropes. However, as usual, Pete couldn't find his measuring tape so he guessed!

When he finally did find his tape (it was under his hat), he discovered that the second piece of rope was twice as long as the first piece minus 35 feet. The third piece of rope was half the length of the first, plus 15 feet. How long were each of the pieces of rope?
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 [Ref: ZGCD] © Kevin Stone [Protected Puzzle]

Difficulty: Easy4 Star RatingPuzzle 9
How many squares, of any size, can be found on a standard chess board?

How many rectangles, of any size, can be found on a standard chess board? Remember when counting the rectangles, that squares are also rectangles.
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 [Ref: ZLYW]

Difficulty: Medium4 Star RatingPuzzle 10
Last week I travelled from London to Leeds, which is a distance of 174 miles. I started at 9.15am and completed the journey with an average speed of 40 miles per hour. On the way back, in the evening, I travelled exactly the same route, starting at 5.15pm. The traffic was light and I completed the journey with an average speed of 60 miles per hour. What was the overall average speed for round trip? The answer is not 50 mph.
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