5. The mass of an empty evaporating dish is 38.86g. When a mixture of sand, sugar and marble chips is added, its mass increased to 40.26g. Water is then added to the mixture and after thorough mixing the liquid part is poured out into a separate beaker. After drying, the mass of the evaporating dish with the remaining undissolved residue is found to be 39.83g. Calculate the concentration of sugar in the original mixture