Joe loses 4 pounds of fluid by sweating during a vigorous basketball game. how many cups of fluid are needed to replenish this loss? 10 cups

One pound will be equal to 453.59 mg while one cups will be equal to 236.59ml. Roughly you can estimate that 1 pound of water will be around 2 cups. Assuming the fluid is mostly water, the density should be 1mg/ml. So, if you convert the 4 pounds mass into volume it would be: 4 pounds * 453.59 (mg/pounds) * (1mg/ml) / (236.59 ml/cups) = 7.66 cups.