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?

Explanation

To solve the problem step by step, we will address both parts of the question: (a) calculating the total mass of the box and (b) finding the difference in the masses of the gold pieces while considering significant figures.

### Step-by-Step Solution:

**Given:**
- Mass of the box = 2.300 kg
- Mass of gold piece 1 = 20.15 g
- Mass of gold piece 2 = 20.17 g
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