- A gasoline engine is a kind of internal combustion engine
- A gasoline engine is a part of gasoline lawn mower
- Hence, an internal combustion engine is a part of gasoline lawn mower

- An internal combustion engine is a part of gasoline lawn mower
- An internal combustion engine usually converts fuel / chemical energy into mechanical energy and heat energy through combustion
- So, the gasoline lawn mower converts chemical energy into mechanical energy

Hence, the gasoline lawn mower converts chemical energy into mechanical energy
Question: Which energy transformation takes place in a gasoline lawn mower?
Context: - An internal combustion engine usually converts fuel / chemical energy into mechanical energy and heat energy through combustion 
- A gasoline engine is a kind of internal combustion engine 
- A gasoline engine is a part of gasoline lawn mower