- A ladybug is a kind of insect
- An insect usually has a small size
- Hence, a ladybug is small in size

- A ladybug is small in size
- Seeing small things with bare eyes is difficult
- Hence, seeing a ladybug with bare eyes is difficult

- Seeing a ladybug with bare eyes is difficult
- Magnifying glass is used to see small things by making objects appear bigger
- Hence, magnifying glass can be used to see a ladybug by making it appear bigger

- Magnifying glass can be used to see a ladybug by making it appear bigger
- A hand lens is a kind of magnifying glass
- So, a hand lens can help seeing the ladybug by magnifying the ladybug

- A hand lens can help seeing the ladybug by magnifying the ladybug
- Counting something usually requires seeing that something
- So, a hand lens can help count the ladybugs

Therefore, a hand lens can help count the ladybugs
Question
Which tool could be used to help someone count the number of ladybugs on a leaf?

Context
- Seeing small things with bare eyes is difficult 
- A hand lens is a kind of magnifying glass 
- A ladybug is a kind of insect 
- An insect usually has a small size 
- Counting something usually requires seeing that something 
- Magnifying glass is used to see small things by making objects appear bigger