1. **State the problem:** We are given the number of kids interested in history, nature, and both subjects, and we need to find the total number of kids in the class. 2. **Identify given values:** - Number of kids into history: $25$ - Number of kids into nature: $28$ - Number of kids into both history and nature: $6$ 3. **Use the principle of inclusion-exclusion:** The total number of kids is given by: $$\text{Total} = \text{History} + \text{Nature} - \text{Both}$$ 4. **Calculate the total:** $$\text{Total} = 25 + 28 - 6 = 47$$ 5. **Conclusion:** There are $47$ kids in the class.