How many liters liters of​ 100% pure acid should be used to make the​ solution?

Question

Pure acid is to be added to a

10​%

acid solution to obtain

90L

of

83​%

solution. What amounts of each should be​ used?

Answer 1

X+Y = 90

0.1*X + Y = 90*0.83 = 74.7

0.1X + 90 - X = 74.7

-0.9X = -15.3

X=17

Y = 73