The following results were obtained from a liquid limit test on a clay using the Casagrande cup device.
Number of blows 6 12 20 28 32
Water Content (%) 52.5 47.1 43.2 38.6 37.0
a) determine the liquid limit of this clay
b) If the natural water conten is 38% and the plastic limit is 23%, calculate the liquidity index
c) Do you expect a brittle type of failure for this soil?