In a lab, a 30% acid solution is being mixed with a 5% acid solution to create a 10% acid solution. What is the ratio of the amount of the 30% solution to the amount of 5% solution used to create the 10% solution?

The 10% mixture is 5 percentage points stronger than the 5% solution and 20 points weaker than the 30% solution. The amounts must therefore be in the inverse ratio: 30% solution to 5% solution = 5:20 = 1:4. So the correct choice is 1:4.

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