Question 1175286
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Hi
 60 liters 
 45% acid, using 2 times as much of the 70% solution as the 25% solution. 
 .15(60L - 3x)) + .25(x)  + .70(2x) = .45(60L)
 .15(60L) - .45x  + .25(x)  + 1.4x   = .45(60L) 
                                  x = .30(60L)/1.2 = 15L of the 25% solution
 15L of the 25% solution, 30L of the 70% solution & 15L of 15% solution
           27=27 checks
Wish You the Best in your Studies.
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