The whole crab = 0.6 lb and the half crab = 0.9 lb. That way together they weigh 1.5 lb AND the half crab weighs half again as much as the whole one.
Then 1/2 of the whole crab is 0.3 lb and all of the half crab is 0.9 lb, and together they weigh 1.2 lb.
Then 1/2 of the whole crab is 0.3 lb and all of the half crab is 0.9 lb, and together they weigh 1.2 lb.
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