A project engineer receives a laboratory report of a sample of soil having moist unit weight of a soil is $20.5 k N / m^{3}$ , water content available is 25% and the specific gravity of the solid of the soil is 3.35. Find the dry unit weight of the soil.

- 1
  
  $16.8 k N / m^{3}$
- 2
  
  $18.4 k N / m^{3}$
- 3
  
  $18.8 k N / m^{3}$
- 4
  
  $16.4 k N / m^{3}$

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