John needs to mix a cleaning solution in the following ratio: 1 part bleach for every 4 parts water. When mixing the solution, John makes a mistake and mixes in half as much bleach as he ought to have. The total solution consists of 36 ml. How many ml of bleach did John put into the solution?
Correct answer: D
Explanation
The ratio that John used by mistake was 1:8.
Thus, 1/9 of the solution is bleach.
(1/9)*36 = 4 ml
The answer is D.
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