<prompt> In an adult man weighing 70 Kgs, the Total body water volume will be about -42L25L15L12L  <response>: Ans. A. 42L60 of body weight is composed of water. Therefore, total body water in a 70 Kg man would be 60 of 70 Kg, ie, 42 Kg, which is equivalent to 42 L. 