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A solution is prepared by dissolving 45 g of sugar in 180 g of water. Calculate the mass percentage of solute. 
Given:
 
Mass of solute (sugar) = g

Mass of solvent (water) = g
 
Mass percentage = / (Mass of the solute + )  x 100
 
By substituting the given in the above formula,
 
= / () x 100
 
= x 100
 
The mass percentage of solute = %