A vessel full of water weighs 40 kg. If its is one-third filled, its weight becomes 20 kg

A vessel full of water weighs 40 kg. If its is one-third filled, its weight becomes 20 kg. What is the weight of the empty vessel?

1. 10 kg
2. 15 kg
3. 20 kg
4. 25 kg

• Answer: The correct option is A
• Explanation:

  Let the weight of vessel be x and weight of water in the vessel be y.

  Now according to the question,

  x + y = 40 kg (1)

  x + (y/3) = 20 kg

  3x + y = 60 kg (2)

  On subtracting equations (1) from equation (2), we get:

  2x = 20

  x = 10 kg

• Exam Year: 2020