Rachel found the masses of three rocks for a science project. the first rock had a mass of 19.28 grams, the second rock had a mass of 25.3 grams, and the third rock had a mass of 46.3 grams. how much greater was the mass of the third rock than the combined mass of the other two rocks?

Mr. murray wants to create 100 ounces of a mixture that is 62% pecans, 30% almonds, and 8% walnuts. how will the amount of mixture a compare to the amounts of mixtures b and c that mr. murray uses? he will use half as much of mixture a as he will use of mixtures b and c combined.he will use one-quarter as much of mixture a as he will use of mixtures b and c combined.he will use one-fifth as much of mixture a as he will use of mixtures b and c combined.he will use twice as much of mixture a as he will use of mixtures b and c combined.