SOLUTION: How many quarts of pure antifreeze should mr. Alberts add to 10 quarts of a 20% antifreeze solution to make a 50% solution?

Question 190383: How many quarts of pure antifreeze should mr. Alberts add to 10 quarts of a 20% antifreeze solution to make a 50% solution?
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!

First condition,
(100%)(AF) + (20%)(10qts) = (50%)(S) -----> Eqn 1

Also we know, AF + 10 qts = S ------> Eqn 2

Substitute Eqn 2 in Eqn 1:

---->
AF = 6 qts , amount of 100% AF needed

We get the total Solution, (via Eqn 2):

Let us check,

Thank you,
Jojo

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