The mass of a box is `2.3 kg`. Two marbles of masses `2.15 g and 12.39 g` are added to it . Find the total mass of the box to the correct number of significant figures.

Explanation

To find the total mass of the box after adding the two marbles, we will follow these steps:

### Step 1: Convert the masses to the same unit
The mass of the box is given in kilograms (kg), while the masses of the marbles are given in grams (g). We need to convert the mass of the box from kilograms to grams for consistency.

- Mass of the box = 2.3 kg = 2.3 × 1000 g = 2300 g

### Step 2: Add the masses of the marbles
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