J.R. S. answered • 09/15/18

Tutor

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Ph.D. in Biochemistry--University Professor--Chemistry Tutor

x = liters of 15% solution

100-x = liters of 40% solution

(x)(15%) + (100-x)(40%) = (100)(25%)

15x + 4000 - 40x = 2500

-25x = -1500

x = 60 liters of 15% solution

100-60 = 40 liters of 40% solution

Done using alligation:

Have.........Want..........Need

15%..............................15 parts

...................25%.......................

40%..............................10 parts

Total parts = 25 parts = 100 ml

Each part = 4 mls

15 x 4 = 60 mls of 15%

10 x 4 = 40 mls of 40%