The correct answer is: $15.7480314961\text{ in}$ (≈ $15.75\text{ in}$).
Explanation
Use the exact conversion $1\text{ in} = 2.54\text{ cm}$. Divide the length in centimetres by 2.54 to get inches.
Steps:
- Conversion factor: $1\text{ in} = 2.54\text{ cm}$
- Compute: $$40\text{ cm} \div 2.54\text{ cm/in} = 15.748031496062992\text{ in}$$
- Round as needed: $ \approx 15.75\text{ in}$ (to two decimal places).
Therefore, 40 cm is about 15.75 inches (more precisely $15.7480314961\text{ in}$).