BrainBashers - Random Puzzles

Puzzle 17

Yesterday I was asked to buy some stamps.

In the land of BrainBashers, stamps are available in denominations of 4p, 5p, 7p, 12p, and 19p (just the five different values).

For three denominations of stamps, I was asked to buy six of each. For the other two denominations. I was asked to buy ten of each.

Unfortunately, I forgot which I was supposed to buy six of, and which to buy ten of!

Luckily I had been given the exact money required to buy the stamps, £3.50, so the shopkeeper was able to work out the stamps I needed.

Which stamps did I have to buy?

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Puzzle 18

What has four legs …

… and only one foot?

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Puzzle 19

Can you fill the thermometers with mercury, such that the numbers outside the grid indicate how many cells in each row and column contain mercury?

Mercury always starts filling from the bottom of a thermometer, and not every thermometer has to contain mercury.

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Puzzle 20

Which one of these sentences is the odd one out? The answer is nothing to do with food or animals.
Jackals are mean, eager scavengers.
Koalas eat in the heat.
Sheep invariably munch old newspapers.
Seals are rare and hungry.
Foxes rich appetite never kicks.

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