Answer:
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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