Answer to the Friday Puzzle….

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On Friday I posted this puzzle…..

Imagine a mythical family in which each daughter has the same number of brothers as she has sisters. In addition, each son has twice as many sisters as he has brothers. How many sons and daughters are there in this mythical family..?

If you have not tried to solve it, have a go now.  For everyone else, the answer is after the break.

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It’s the Friday Puzzle

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First, as I mentioned yesterday, we have just released the Night School Sleep music on iTunes.  This 30 minute piece is scientifically designed to help you fall asleep and can be downloaded here.

Second, today I am off to New York City to see the premiere of a new documentary about James Randi.  I have seen a rough cut and it looks jolly good.  You can see the trailer here. If you get a chance to see it, go watch.

Finally, here’s the puzzle.  Please do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

Imagine a mythical family in which each daughter has the same number of brothers as she has sisters. In addition, each son has twice as many sisters as he has brothers. How many sons and daughters are there in this mythical family..?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

Can you spot the woman?

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First, we have just released the Night School Sleep music on iTunes.  This 30 minute piece is scientifically designed to help you fall asleep and can be downloaded here.

Second, James F sent me this rather lovely illusion.  This ‘parrot’ is actually a female model posing for body painter Johannes Stötter. Can you spot her? If not, there are clues after the break.

parrot

 

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It’s the Friday Puzzle!

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Please do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

I have a 100 pound watermelon laying out in the sun. 99% of the watermelon’s weight is water. After a few hours 98% of the watermelon’s weight is water. How much water evaporated?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

Answer to the Friday Puzzle…

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coverOn Friday I posted this puzzle….

My friend has 4 pieces of jewelry – a ring, a necklace, a bracelet and a brooch.  Given that she can wear any number of the objects when she goes out, how many combinations of her jewelry does she have to choose from?

If you have not tried to solve it, have a go now.  For everyone else, the answer is after the break. Continue reading

It’s the Friday Puzzle!

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coverFirst, we have just released some new research showing that millions of people in the UK are now sleep deprived.  If you want to discover if you need more sleep, we have created The Sleep Test.  Hope you find it interesting.

Second, here is the puzzle. Please do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

My friend has 4 pieces of jewelry – a ring, a necklace, a bracelet and a brooch.  Given that she can wear any number of the objects when she goes out, how many combinations of her jewelry does she have to choose from?

 

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.