Category: Puzzle

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Brothers

Here’s an old puzzle, but a good one. Try to answer before you look at the next page. Also, assume the likelihood of a boy or girl is the same (it just makes it easier).

Mr and Mrs Jones have two children. One is a boy.

What is the probability the other is a boy?

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Puzzle

A family member sent me a puzzle the other day. It had apparently appeared on tv in a quiz and was worth close to £100,000.

I did not see the show, and here is my version of the question:

there are 100 people in a room. 99% are left handed. How many left handed people need to leave the room to bring the percentage down to 98%?

There are plenty of people doing this on-line, including this:

It’s fine to do it by algebra, but you couldn’t and wouldn’t use this method on tv in a timed quiz for a huge sum of money. But we know why he has posted this – the arithmetic is really interesting.

Have a go yourself, then look at the next page.

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Here

Here are the answers from yesterday, in order from the easiest.

Southerly. No surprise here, Hawaii.

It’s not below the equator, of course, but it is very much farther south than eg Florida.

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