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Old Skool Maths


Vista

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On 18/02/2018 at 21:22, jpayne said:

yep 15

got nothing to do with old or new maths just plain everyday normal mathematical rules and powers of observation!

 

Yep, I would go with 15 as well. Question is designed to trip you up though - in the real world you wouldn't write it that way.

 

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