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Weighing Jelly Babies Puzzle
The Puzzle:
Real jelly babies have a mass of 10 grams, while imitation jelly babies have a mass of 9 grams.
Spike has 7 cartons of jelly babies, 4 of which contain real jelly babies, the others imitation.
Using a scale only once (and minimum disturbance of the boxes contents!), how can Spike determine which cartons contain real jelly babies?
Do you have the answer? Check against our solution!