Amixture was found to contain 3.50 g of sugar, 4.80 g of nacl, and 7.20 g of sand. what is the percentage of sand?

First get the sum of the mass of each substance.

total mass = 3.50 g + 4.80 g + 7.20 g

total mass = 15.50 g

The percentage mass would be:

% mass = (7.20 g / 15.50 g) * 100%

% mass = 46.45%

your parents i think this could be it