The percentage of fine aggregate to the combined aggregate (P) is obtained by the relation -

[Where, X,Y and Z= Fineness modulii for coarse, fine and combined aggregates respectively]

- 1
  
  P = X+Y/X+Z x 100
- 2
  
  P = X-Y/X-Z x 100
- 3
  
  P = X-Z/Z-Y x 100
- 4
  
  P = Z-Y/X-Z x 100

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