In the lab, maria has two solutions that contain alcohol and is mixing them with each other. she uses 3 times as much solution a as solution b. solution a is 17% alcohol and solution b is 20% alcohol. how many milliliters of solution b does she use, if the resulting mixture has 213 milliliters of pure alcohol?

the answer is 53.35 ml of solution B

Working - there are 4 parts in total (1 part solution B and 3 parts solution A)

therefore 213 divide 4 = 53.24 ml

Check - 53.25 x 1 = 53.25

and 53.25 x 3 = 159.75

Add 53.25 and 159.75 = 213

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