according to a human modeling project, the distribution of foot lengths of 16- to 17-year-old boys is approximately normal with a mean of centimeters and a standard deviation of centimeters. in the united states, a man's size shoe fits a foot that is centimeters long. what percentage of boys of this age group will wear a size shoe or larger?

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Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.

What are three good health practices children need for a lifetime?