SOLUTION: What quantity of 70 per cent acid solution must be mixed with a 30 solution to produce 480 mL of a 50 per cent solution?

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Question 347503: What quantity of 70 per cent acid solution must be mixed with a 30 solution to produce 480 mL of a 50 per cent solution?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
70% - x ml
30% - 480-x
Mixture = 50% - 480 ml
...
0.7x+0.3(480-x)=0.5*480
0.7x+144-0.3x=240
0.4x=240-144
0.4x=96
x= 96/0.4
x=240 ml ----- 70% solution