The mass of a box measured by a grocer's balance is 2.300kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of the box, (b) the difference in the masses of the pieces to correct significant figures?
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(a) Total mass of the box `=(2.3+0.0217+0.0215)kg=2.3442 kg` <br> Since the least number of decimal places is 1, therefore, the mass of the box `=2.3 kg` <br> (b) Difference of mass `=2.17-2.15=0.02 g` <br> Since the least number of decimal places is 2 so the difference in masses to the correct significant figures is 0.02 g.