Yesterday at our local highschool there were
- 29 pupils wearing BLACK coats
- 27 wearing RED coats,
- and 40 wearing BLUE coats.
How many pupils were wearing GREEN coats?
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Aah, such an old chestnut...
Just use the numbering A=1, B=2, C=3, D=4, E=5, ..., G=7, ..., N=14,..., R=18, ..., Z=26
Then BLACK=29, RED=27, BLUE=40,
and there were 49 pupils with GREEN coats
There were 0 wearing green coats, you mentioned everybody's coat color already!
All the other color coats were there to serve as red herrings and to show everybody's coat had been mentioned.