SOLUTION: one grade of oil has .50% of an additive. a higher grade has .75% of the additive. how many quarts of each must be used to have 250 quarts of a mixture with .65% of the additive?

Question 1052044: one grade of oil has .50% of an additive. a higher grade has .75% of the additive. how many quarts of each must be used to have 250 quarts of a mixture with .65% of the additive?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = quarts of the .5 % oil
Let = quarts of the .75% oil
---------------------------------
(1) quarts
(2)
-------------------------------------
(2)
(2)
(2)
(2)
Multiply both sides of (1) by and
subtract (1) from (2)
(2)
(1)
---------------------------

and
(1)
(1)
(1)
-------------------------
100 quarts of the .5 % oil are needed
150 quarts of the .75% oil are needed
-----------------------------------
(2)
(2)
(2)
(2)
OK

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