Amount of oxygen supplied by `100 ml` arterial blood while passing through the tissues is

Durning strenuous exercise, the muscle interstitial fluid pO_(2) falls to 20 mm Hg. The oxygen delivered by blood that passes through the exercising muscle tissus will be

The amount of oxygen transported by 100ml of blood under strenuous condition is approximately

During normal physiological condition of body, each 100 ml oxygenated blood supplies the how much O_(​2) ​ to the tissues ?