If W1, W2, W3 and W4 are weights of sand in oven dry, air dry, saturated but surface dry and moist conditions respectively, then the moisture content of sand is

- 1
  
  W3 - W1
- 2
  
  W4 - W2
- 3
  
  W4 - W3
- 4
  
  W3 - W2

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