Quote:
Originally Posted by GeoffC
2x is indeed correct - the student, however, gave the answer as 3....
The error is entirely mine, I typed the question too literally and should have refrained from writing it mathematically.
3x take away x is indeed 2x; however the student in their wisdom came up with the answer 3......!
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Lateral thinking(*) on the student's part
Think of it this way - write 3x in pencil. Take away the x with an eraser. You're left with 3
(* I'm either being rather generous or somewhat facetious. Ihaven't decided which, yet)