Day - 10 Dr. Sahab Series

Dr. Robert Edwards , Dr . Patrik Steptoe and Dr. Indira Hinduja are famous for their work on

10 cows can graze in a field for 15 days and 20 cows can graze in the same field for 10 days. For how many days can 30 cows graze in the field? (a) 5 days (b) 7(1)/(2) days (c) 7(2)/(3) days (d) 8(1)/(3) days

Dr.M.S. Swaminathan is associated with