A 20% salt solution of 100 liters is mixed with a quantity of 10% solution. the resulting solution was 12% salt. How much was 10% solution added?
a) 175 lit b) 200 lit c) 400 lit d) 500 lit

• c) 400 litres
  
  Let 'x' litres of 10% solution is added to 20% salt solution of 100 litres, then
  Percentage of salt in resultant solution = (20 + 0.1x) / (100+x) = 12/100
  Solving, we get x=400
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