An open box with sides 0.5 cm thick, bottom 1 cm thick, internal dimensions 14 × 10 × 8 cm is filled with water. If water weighs 1000 kg per cubic metre, then what is the weight of the box with water?
A.1·850 kg✓ Correct
B.1·900 kg
C.2·050 kg
D.2·100 kg
Explanation
Material weight = 730 gm (from previous problem). Water volume = 14 × 10 × 8 = 1120 cm³. Water weight = 1120 × 1000/10⁶ kg = 1.120 kg = 1120 gm. Total = 730 + 1120 = 1850 gm = 1.850 kg.
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