Answer:
Helena uses double the amount of water to the amount of vinegar.
Explanation:
- A unit rate is a ratio that is used to compare different kinds of quantities.
- A unit rate describes how many units of the first quantity corresponds to one unit of the second quantity.
- So, unit rate of water to vinegar means how much water is needed corresponding to 1 unit of vinegar.
- Formula:

- Thus, for every 1 unit of vinegar, one needs two units of water.
Thus, Helena uses double the amount of water to the amount of vinegar.