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Problem based on volume - volume percentage:-
  
 Calculate the volume of ethanol in 200 ml solution of 20% v/v aqueous solution of ethanol.
 
Volume of aqueous solution = 200 ml
 
Volume percentage = 20%
 
Volume percentage = x 100.
 
20 = Volume of ethanol / x 100.
 
Volume of ethanol = / 100.
 
Volume of ethanol = ml.