A vessel full of water weighs 4o kg. If it is one-third filled, its weight becomes 20 kg. What is the weight of the empty vessel?
10 kg
15 kg
20 kg
25 kg
Regular method: Let the weight of empty vessel = v and weight of water = w, then by the conditions given we have v + w = 40 …. (1) and v + w/3 = 20 …. (2) By solving equations (1) and (2) simultaneously we have w = 30 and v = 10.
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