Try another version of this question A chemist creates `220` milliliters of a `50 %` alcohol solution by combining a `40 %` alcohol solution with a `60 %` alcohol solution. If `x` represents the amount of the `40 %` alcohol solution used and `y` represents the amount of the `60 %` alcohol solution used, which of the following could be used to model the given information? Box 1: Select the best answer
`{(x,+,y,=,220),(0.4x,+,0.6y,=,110):}`