15 Gallons of a 3% acid solution is mixed with 10 gallons of a 7% Solution.

How many gallons are in the final mixture?

What is the percent of acid in the final mixture?

Correct answer: 25 gallons and 4.6%

Step-by-step explanation:

We will solve this problem using the following equation:

15 · 3 + 10 · 7 = 25 · x ⇒ 45 + 70 = 25 x ⇒ 25 x = 115

x = 115 / 25 = 4.6 %

if you mix 15 gallons with 10 gallons you get a total of 25 gallons of mixture.

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