SOLUTION: How much water needs to be added to a half ounce of a solution in which the active ingredient is 10% so as to make that half ounce of solution into having .5% of the active ingredi

Question 458816: How much water needs to be added to a half ounce of a solution in which the active ingredient is 10% so as to make that half ounce of solution into having .5% of the active ingredient?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How much water needs to be added to a half ounce of a solution in which the active ingredient is 10% so as to make that half ounce of solution into having .5% of the active ingredient?
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Equation:
active + active = active
0.10*(1/2) + 0*x = 0.005((1/2)+x))
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Multiply thru by 1000 to get:
50 + 0 = (5/2) + 5x
5x = 47.5
x = 9.5 ounces (amt of water needed)
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Cheers,
Stan H.
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