SOLUTION: A reservoir containing 1 million gallons of water has been tainted with arsenic. Scientists conducted several tests and found that the solution in the reservoir is 2% arsenic. Alth

Question 842253: A reservoir containing 1 million gallons of water has been tainted with arsenic. Scientists conducted several tests and found that the solution in the reservoir is 2% arsenic. Although scientists realize that the arsenic can't be removed from the supply, they do understand that they can reduce the percentage to safe levels. A safe level of arsenic is .001% How much water must be added to the reservoir to make the water safe to drink?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
from aspect of water
2%=.02
.001%=.00001
.98*1000000+x=.99999*(1000000+x)
x = 1.999 *10^9 or 1.999 billion gallons of water
from aspect of arsenic
.02(1000000)=.00001*(1000000+y)
y= 1.999 *10^9 or 1.999 billion gallons of water
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