SOLUTION: 8. You have 5 gallon of a solution that is 5% oil (the rest is gasoline). You need to add how much pure gasoline to lower the solution to 4% oil? 9. You have two solutions one co

Question 999695: 8. You have 5 gallon of a solution that is 5% oil (the rest is gasoline). You need to add how much pure gasoline to lower the solution to 4% oil?
9. You have two solutions one contains 40% acid, the other 10% acid. You require 10 gallons of a 20% solution. How much of the 10% should you use?

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The first question is a dilution. You are adding a material which contains zero amount of the solute to be diluted.

Second question is two-part mixture for known amount of resulting mixture. You can do all in one single variable if you want.
y, the gallons volume of the 10%
10-y, the volume of the 40%
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Check the available lessons.
Available lessons, some of them being for Mixture problems

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