Q$1-)$ In triaxial compression test a sampled under axial load of $225$ kPa creating a pore pressure of $36$

kPa. A second sample from same soil failed under a deviator stress of $150$ kPa at an effective shear

resistance of $66\mathrm{.}20$ kPa when subjected to effective lateral stress of $43$ kPa. Determine the total

deviator stress under which the first sample was failed.