Percentage of dry portion in human body =100−60=40%
percentage of protein in human body=240=20%
Mass of human body=140lb
Mass of protein in human body=10020×140=28lb
now,
1lb=0.45359237kg
28lb=28×0.45359237=12.7kg
So, mass of protein in 140lb person =28lb=12.7kg
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