The addition of three masses 1.6 g, 7.32 g and 4.238 g. addressed upto proper decimal places is

Options

A. 13.158 g
B. 13.2 g
C. 13.16 g
D. 13.15 g

Answer

To solve the problem of adding the three masses (1.6 g, 7.32 g, and 4.238 g) and addressing the result to the proper decimal places, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Values**:
- Mass 1 (m1) = 1.6 g
- Mass 2 (m2) = 7.32 g
- Mass 3 (m3) = 4.238 g

2. **Align the Numbers for Addition**:
- Write the numbers in a column format aligning the decimal points:
```
1.600
7.320
4.238
```

3. **Perform the Addition**:
- Start adding from the rightmost column:
- Thousandths place: 0 + 0 + 8 = 8
- Hundredths place: 0 + 2 + 3 = 5
- Tenths place: 6 + 3 + 2 = 11 (write down 1 and carry over 1)
- Units place: 1 (carry) + 1 + 7 + 4 = 13 (write down 3 and carry over 1)
- Tens place: 1 (carry) = 1
- The total sum is 13.158 g.

4. **Determine the Proper Decimal Places**:
- The least precise measurement (1.6 g) has one decimal place.
- Therefore, we should round the result to one decimal place.

5. **Rounding the Result**:
- The result is 13.158 g.
- Rounding to one decimal place gives us 13.2 g.

6. **Final Answer**:
- The final answer, addressed to the proper decimal places, is **13.2 g**.