SOLUTION: You are making 10 tons of concrete that is 48.5% cement by mixing a 12% cement mixture with a 85% cement mixture. How much of the 85% cement mixture must you use? How much of the

Question 533274: You are making 10 tons of concrete that is 48.5% cement by mixing a 12% cement mixture with a 85% cement mixture. How much of the 85% cement mixture must you use? How much of the 12% cement mixture must
you use
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = tons of 12% mixture needed
Let = tons of 85% mixture needed
given:
(1)
(2)
----------------------------
(2)
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
5 tons of 12% mixture are needed
5 tons of 85% mixture are needed
check:
(2)
(2)
(2)
(2)
OK
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