a chemist need 400 ml of 12% hydrochloric acid solution. there are 10% and 15% solutions available, how much of each available solutions should be mixed to get the desired result?
Let x be 10% solution and y be 15% solution
0.1 x+ 0.15 y =0.12(x+y)
0.15y-0.12 y = 0.12x-0.1 x
0.03 y = 0.02x
3 y =2x
10% solution 240 ml
15% solution 160 ml
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