The fine fraction

PROB..#1. The fine fraction (passing # 200 sieve ) in a sand is about 25 % and it has clay fraction (< 0.005 mm) = 10%. The maximum dry unit weight of the soil determined by following the standard ASTM procedure was found to be 19.5 kN/m3. The specific gravity is 2.66. What will be the estimated minimum dry unit weight?. What will be the relative density when the field dry unit weight of this soil is 18.1 KN/m3.