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As Thick as a Brick?

If a brick weighs a pound and half a brick, what does a brick and a half weigh?

Three pounds. If a brick were cut in half, the two halves could be described as "a pound here and half a brick there", therefore half a brick weighs a pound. A full brick would then weigh 2 pounds, and a brick and a half (a brick) weighs three pounds.
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