Question 823747
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Hi,
Gabe Amodeo,a nuclear physicist, needs <u>50 liters</u> of a 60% acid solution. 
he currently has a 20% solution and a 70% solution. 
Let {{{highlight_green(x)}}} and {{{highlight_green(50-x)}}}represent the amount of the 70% and 20% solutions respectively
Question states***
 .70x + .20(50-x) = .60*50L    |multiplying thru by 100
  70x + 20(50-x) = 3000L
       50x = 2000L
         x =40 L of 70% solution
and {{{highlight_green(50-x)}}} is 10 L of 20% solution