Gomes found the masses of three rocks for a science project. The first rock had a mass of 19.29 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?

Mass of first rock is 19.29

Mass of second rock is 25.3

Mass of third rock is 46.3

Add up the mass of the first and second rock.

19.29 + 25.3 = 44.59

Now, we need to know how much greater the mass of the third rock is than the combined mass of the other two rocks. That means subtraction.

46.3 - 44.59 = 1.71

Your answer is 1.71.