Question

A mixture of alcohol and water contains a total of 35oz of liquid. There are 7oz of pure alcohol in the mixture. What percent of the mixture is water? What percent is alcohol?

Answer 1

The mixture has two components, this means that we can calculate the percentages if we divide the portion of water or alcohol by the total amount of the mixture.

For alcohol:

$\frac{7oz}{35oz}\times100=0.2\times100=20\%$

For water:

$\frac{35oz-7oz}{35oz}\times100=0.8\times100=80\%$

Answer:

The mixture is 20% alcohol and 80% water