18 men built a tanker in 25 days. How many days would it take for 10 men?

Options

A. 45.2
B. 45.1
C. 46
D. 45

Answer

To solve the problem of how many days it would take for 10 men to build a tanker, given that 18 men can do it in 25 days, we can follow these steps:

### Step-by-Step Solution:

1. **Determine the total work done in man-days**:
- If 18 men can build a tanker in 25 days, we can calculate the total work in man-days.
- Total work = Number of men × Number of days
- Total work = 18 men × 25 days = 450 man-days.

2. **Calculate the number of days for 10 men**:
- We need to find out how many days it will take for 10 men to complete the same amount of work (450 man-days).
- Let the number of days required for 10 men be \( x \).
- Therefore, we can set up the equation:
\[ 10 \text{ men} \times x \text{ days} = 450 \text{ man-days} \]

3. **Solve for \( x \)**:
- Rearranging the equation gives us:
\[ x = \frac{450 \text{ man-days}}{10 \text{ men}} = 45 \text{ days} \]

4. **Conclusion**:
- It would take 10 men 45 days to build the tanker.

### Final Answer:
The answer is 45 days.