Hank and lynn are both paying off car loans.

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 would you do with the money left over after all monthly expenses are paid

The atomic mass of an element is equal to the number of: 1. protons 2. protons plus neutrons 3. protons plus electrons 4. neutrons