SOLUTION: The active ingredient in one type of Ortho insect spray is 50% malathion. The instructions on the bottle say to add 1 fluid ounce to a gallon (128 fluid ounces) of water. What perc

Question 659080: The active ingredient in one type of Ortho insect spray is 50% malathion. The instructions on the bottle say to add 1 fluid ounce to a gallon (128 fluid ounces) of water. What percent of malathion will be in the mixture?
Found 2 solutions by colliefan, Alan3354:
Answer by colliefan(242) (Show Source): You can put this solution on YOUR website!
Percentage = part/whole
Part:
You are adding 1 ounce, but only half of it is malathion. So the part is 0.5 oz.

Whole:
you have added 1 oz to 128 oz so the whole is 129 oz

percentage = 0.5 ounce/129 oz
pct = 3.9% (this is rounded)

(Bottom line: don't use toxins like malathion.)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The active ingredient in one type of Ortho insect spray is 50% malathion. The instructions on the bottle say to add 1 fluid ounce to a gallon (128 fluid ounces) of water. What percent of malathion will be in the mixture?
-----------
Total solution = 129
malathion = 0.5
0.5/129 =~ 0.39%

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