Back to School...

Brain Bender style. Ready??

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In a single classroom, one-third of the pupils* had red hair, one-half had brown hair and five had black hair.

How many pupils were there all together?

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And what's the deal - no blondes?? That doesn't seem right... Anyway, you know how to play. The answer will be found later in the comments.

*I keep picturing hairy eyeballs though... I must be tired.

Update: Oddybobo isn't tired! She's today's very speedy Smartypants!