A company makes a mixture which contains 2% alcohol. If 10 litres of alcohol is added to the mixture, then the concentration increases to 5%. What is the approx. quantity of the mixture?
A. 316
B. 315
C. 310
D. 300

• A. 316
  
  Let in the mixture of x litres, quantity of alcohol=(2/100)*x=x/50 litres.
  When 10 litres of alcohol is added, quantity of mixture= (x+10) litres and
  Quantity of alcohol=10+ x/50 litres.
  So % of alcohol in new mixture= (10 + x/50)/(x+10) = 5/100
  =>100(500+x) = 250(x+10)
  => 2(500+x) =5(x+10)
  => x= 950/3= 316.66 ~ 316 litres.
• 7 years agoHelpfull: Yes(1) No(1)