1000 soldiers in a fort had enough food for 20 days. but some soldiers were transferred to another fort and the food lasted for 25 days. How many soldiers were transferred ?

Explanation

To solve the problem, we will use the concept of direct variation. The amount of food available is directly proportional to the number of soldiers and the number of days the food lasts.

### Step-by-Step Solution:

1. **Calculate the total amount of food available initially:**
The total food can be calculated as the product of the number of soldiers and the number of days the food lasts.
\[
\text{Total Food} = \text{Number of Soldiers} \times \text{Number of Days}
...