The void ratio of a soil is 0.55 at an effective normal stress of 140 kPa. The compression index of the soil is 0.25

Q. The void ratio of a soil is 0.55 at an effective normal stress of 140 kPa. The compression index of the soil is 0.25. In order to reduce the void ratio to 0.4, an increase in the magnitude of effective normal stress (in kPa, up to one decimal place) should be                                                  

Ans: 416.0-420.0

Sol: