Alexandra needs to mix cleaning solution in the ratio of 1 part bleach for every 4 parts water. When mixing the solution, Alexandra makes a mistake and mixes in half as much bleach as she ought to have. The total solution consists of 27 mL. How much bleach did Alexandra put into the solution?

The intended ratio of bleach to water is 1 to 4, but she uses half the required bleach, meaning the actual ratio becomes 0.5 to 4. Simplifying the ratio 0.5 to 4 gives 1 to 8, meaning bleach makes up 1 part out of the total 9 parts of the solution. The total mixture is 27 mL, so the amount of bleach is 1/9 of 27, which is 3 mL. The amount of bleach put into the solution is 3 mL.

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