To make plaster, you need 2 cups mixture to 5 cups of water. there are 20 cups in a box of mixture.
how many cups of water do you need to mix the entire box of plaster?

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%