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Let's solve each problem in the image step-by-step.

### (a) If 15 men drink 2000 liters in 20 days, how many liters will 25 men drink in 5 days?

First, find the amount of water consumed by 1 man in 1 day:
- 15 men drink 2000 liters in 20 days
- Therefore, 1 man drinks \( \frac{2000 \text{ liters}}{15 \text{ men} \times 20 \text{ days}} = \frac{2000}{300} = \frac{20}{3} \approx 6.67 \text{ liters per day} \)

Now, calculate the total amount consumed by 25 men in 5 days:
- \( 1 \text{ man drinks} \approx 6.67 \text{ liters per day} \)
- \( 25 \text{ men will drink} = 25 \times 6.67 = 166.67 \text{ liters per day} \)
- For 5 days: \( 166.67 \times 5 = 833.33 \text{ liters} \)

So, 25 men will drink approximately 833.33 liters in 5 days.

### (b) A ship sails 800 kilometers in 32 days. How many days will it take to sail 2540 kilometers?

First, find the rate of sailing per day:
- 800 kilometers in 32 days
- \( \text{Rate} = \frac{800 \text{ kilometers}}{32 \text{ days}} = 25 \text{ kilometers per day} \)

Now, calculate the time to sail 2540 kilometers:
- \( \text{Time} = \frac{2540 \text{ kilometers}}{25 \text{ kilometers per day}} = 101.6 \text{ days} \)

So, it will take approximately 101.6 days to sail 2540 kilometers.

### (c) 1300 candidates appeared for an examination and out of 1300 candidates, 520 candidates failed. Find the percentage of success.

First, find the number of candidates who passed:
- \( \text{Passed} = 1300 - 520 = 780 \)

Now, calculate the percentage of success:
- \( \text{Percentage of success} = \frac{780}{1300} \times 100 \approx 60\% \)

So, the percentage of success is 60%.

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Would you like more details or have any questions about these solutions?

Here are some related questions you might find helpful:
1. How many liters would 10 men drink in 10 days, given the same conditions?
2. If the ship increased its speed and could sail 1000 kilometers in 32 days, how many days would it take to sail 2540 kilometers?
3. If 200 candidates out of the 1300 reappear for the examination, and 150 of them pass, what would be the new percentage of success?
4. If 15 men were to drink 3000 liters in 20 days, how many liters would 20 men drink in 15 days?
5. How would the time change if the ship had to sail 1000 kilometers with a daily speed increase of 2 kilometers per day?

**Tip:** Always break down the problem into smaller parts to make the calculations easier and more manageable.

If 15 men drink 2000 liters in 20 days, how many liters will 25 men drink in 5 days?
A ship sails 800 kilometers in 32 days. How many days will it take to sail 2540 kilometers?
1300 candidates appeared for an examination and out of 1300 candidates, 520 candidates failed. Find the percentage of success.

Learn how to solve problems involving proportion, unitary methods, and percentage calculations. We solve a problem of water consumption by men over a period of days, calculate the days for a ship to travel a given distance, and determine the percentage of success in an exam.

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