# 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

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 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(57219)   (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? ----- Equation: active + active = active 0.10*(1/2) + 0*x = 0.005((1/2)+x)) ----------------------------------------- Multiply thru by 1000 to get: 50 + 0 = (5/2) + 5x 5x = 47.5 x = 9.5 ounces (amt of water needed) ----------------------- Cheers, Stan H.