A cartoon of books has `35%` Math books, `30%` Physics books and the rest are Chemistry books. Find what per cent of books Chemistry books in the carton.

Answer

To find the percentage of Chemistry books in the carton, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the percentages of Math and Physics books**:
- Math books = 35%
- Physics books = 30%

2. **Calculate the total percentage of Math and Physics books**:
- Total percentage of Math and Physics = 35% + 30% = 65%

3. **Determine the percentage of Chemistry books**:
- Since the total percentage of all types of books must equal 100%, we can find the percentage of Chemistry books by subtracting the total percentage of Math and Physics from 100%.
- Percentage of Chemistry books = 100% - Total percentage of Math and Physics
- Percentage of Chemistry books = 100% - 65% = 35%

4. **Conclusion**:
- Therefore, the percentage of Chemistry books in the carton is **35%**.