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Ilia_Sergeevich [38]
2 years ago
5

Pure acid is to be added to a 10% acid solution to obtain 90L of 81% solution. What amounts of each should be used?

Mathematics
1 answer:
Vlada [557]2 years ago
7 0

Answer:

Step-by-step explanation:

let X be the quantity of 100% acid

let Y be the quantity of  10% acid

X + Y = 90

Y = 90 - X

         X(100) + Y(10) = 90(81)

X(100) + (90 - X)(10) = 90(81)

   100X + 900 - 10X = 7290

                         90X = 6390

                              X = 71 L

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