Answer
2 lb for 2 beakers filled with water
Work Step by Step
Each beaker is 0.5 lb (2.0 lb / 4 = 0.5 lb) and each beaker can hold 0.5 lb of water.
4 empty beakers = 2 beakers filled with water
1 lb / beaker with water = 2 lb for 2 beakers filled with water