Katiasnow09go Katiasnow09go Mathematics Answered The average weight of a mature human brain is approximately 1400 grams. What is the equivalent weight in pounds? Use the conversion equivalency 1 kilograms (kg) = 1000 grams (g) and 2.20 pounds (lb) = 1 kg. a. 5.11 lb b. 3.08 lb c. 636 lb d. 25.8 lb