Multiple choice general knowledge Brain Consists of How much % Water ?(Only in Brain Don't Compare with Body Water) 80% 50% 20% 40% Reveal answer Fill a bubble to check yourself A Correct answer Explanation The brain is approximately 75-78% water by weight. While 80% is commonly cited in older sources, modern measurements place it closer to 75-78%. However, 80% is the best available approximation among these options.