If a crab and a half weigh a pound and a half, but the half crab weighs half as much again as the whole crab, what do half the whole crab and the whole of the half crab weigh?
REVEAL THE ANSWER
2.1 pounds. The whole crab must weigh 0.6 pounds, and the half crab 0.9 pounds, totaling 1 1/2 pounds. If the former were halved and the latter doubled, the weights would then be 0.8 and 1.8 pounds, totaling 2.1 pounds.