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12-06-2020
Mathematics

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Andrea has 800L of acid solution. She obtained it by mixing some 7% acid with some 10% acid. Her final mixture of 800L is 9.25% acid. How much of the 7% and 10% solutions did she use to make her finalmixture?

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12-06-2020

Answer:

600,200

Step-by-step explanation:

so we need 74L of acid and there is 800L of solution and we get the equation 0.1x+0.07y=74 and x+y=800 so we get x=600 and y=200

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