Question

anna-maria has added 4 quarts of an alcohol in water solution to 1 quart of water and her ending product is a 36% alcohol in water solution. what was the concentration of the 4 quarts of alcohol solution that was added?

Answer 1

The amount of the final solution is 4 + 1 = 5 quarts.
The amount of alcohol in the final solution is 5 * 0.36 = 1.8 quarts.
The concentration of alcohol in the 4 quarts of alcohol solution that was added is:
$\frac{1.8}{4}\times100=45\ percent$

Answer 2

Ok so
4qt of water/alcohol with ?% concentration alcohol+1 quart of water with 0% concentration alcohol=36% of alcohol

find ?%

find how many quarts total
4+1=5
5 quarts total
36% of that was alcohol
5*0.36=1.8qt alcohol

1.8 out of 4 is 1.8/4=0.45=45%

answer is 45% alcohol concentration