Question 816338
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Hi,
how many liters 'x' of a 30% alcohol solution 
must be mixed with 30 liters of an 80% solution to get a 60% solution?
{{{30x +  80*30L = 60(x+30L)}}}   |  After multiplying thru by 100
Solve for x
  {{{20*30L/30 = x}}}