Question

How many ounces of a ​17 % alcohol solution must be mixed with 4 ounces of a 20 ​% alcohol solution to make a 19 ​% alcohol​ solution?

Answer 1

• 4 ounces

Explanation:

Let the required amount is x.

Alcohol content is same at the end:

• x*0.17 + 4*0.2 = (x + 4)*0.19
• 0.17x + 0.8 = 0.19x + 0.72
• 0.19x - 0.17x = 0.8 - 0.72
• 0.02x = 0.08
• x = 0.08/0.02
• x = 4