Be careful !

A pen and pencil together cost £1.10. The pen costs £1 more than the pencil. How much does the pencil cost ?

Most people's gut answer is 10p, but they'd be wrong.

Very few of the really good business people I've met would have been fooled. Not because they're better at maths, but because they don't take things at face value. They question, query, seek to understand, reach answers for themselves, and are not swayed by others' opinions.

Only when they feel they have a good grip of the situation do they come to a conclusion.

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