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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1
Rock Quality Designation (RQD) can be given as = RQD(in percentage)= (Total length of recovered pieces/Drilling depth)×100 RQD= (21/35)×100= 0.6×100= 60% So RQD=60% is the answer ....