Classify the following soils using the given grain size distribution (ASTM system) and Atterberg Limits data:
a - 42% passed 4.75mm sieve; 4% passed 0.075mm sieve; Cu=18, Cc=2.1
b - 14% retained on 4.75mm sieve; 60% passed 0.075mm sieve; liquid limit (LL)=65; Plastic Limit (PL) = 35