# Pharmacist

The pharmacist had a 12 liters vessel herbal lotion, which contained a 30% active ingredient. Her assistant poured 18 liters of herbal lotion containing 45% of the active ingredient into a container. What percentage of herbal lotion was produced?

## Correct answer:

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### You need to know the following knowledge to solve this word math problem:

**statistics**- weighted average
**algebra**- expression of a variable from the formula
**basic functions**- percentages

### Units of physical quantities:

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