SOLUTION: a radiator contains 25 quartz of water and antifreeze solution, which of 60 percent (by volume) is antifreeze. how much of this solution should be drained and replaced with water f

Question 427227: a radiator contains 25 quartz of water and antifreeze solution, which of 60 percent (by volume) is antifreeze. how much of this solution should be drained and replaced with water for the new solution to be 40 percent antifreeze.?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
.........Percent ---------------- quantity
Solution A 60 ---------------- 30
Water 0----------------x
Total 40----------------30+x
60*25+0* x=40(25+ x)
1500 + 0 x = 1000 + 40 x
0 x - 40 x = 1000 - 1500
-40 x = -500
/-40

x=12.5 quartz water
12.5 quartz of solution has to be drained.

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