mixture problem
Level
pending
how many liter of a 70% acid solution should be added to a 250 liter solution which contains 25% acid so that the resulting mixture will be 40% acid?
125
145
215
110
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1 solution
X liter of 0.7 acid solution + 250liter of 0.25 acid solution=(250+x) of 0.4 acid solution. Therefore, 0.7x + 0.25(250) = 0.4(250+x)=> x=125