a solution of urea in water contains 16grams of it in 120 grams of solution. find out the mass percentage of the urea

Mass percent = (Mass of solute / Mass of solution ) $\times$ 100 
Where, Mass of solution = Mass of solute + Mass of solvent.
Here, 
Mass of solution = 120 g 
Mass of solute = 16 g 
Mass percent = 16/120 $\times$ 100 
= 13.33