A scientist needs 20mL of a 18% acid solution for an experiment. The lab has available a 30% solution and a 10% solution. How many milliliters of the 30% solution and how many milliliters of the 10% solution should the scientist mix to make the 15% solution?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.