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Brainteaser: Fred’s weird teacher Brainteaser

by David, 18 September 2014 | 0 comments

Macro shot of human hand drawing red check mark in checklist box

Fred’s teacher has a weird way of marking tests. He gives five marks for a right answer, but subtracts one for a wrong one. Fred answered 20 questions on a test and got 70 marks. How many questions did Fred get right?

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