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Susie ran a race. she ran 55 miles an hour, and the race took her tt hours to complete.

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 should students do prior to taking the act science test? o a. determine whether they need to skip the optional act science test prior to registering for a test date o b. take first-year college courses related to science o c. enroll in dual enrollment courses to have a college-level understanding of science o d. take high school courses in earth science, physical science, and biology submit