Should be an easy but conceptual problem

[kenny1999]

Homework Statement

This is a question I once encountered with a window advertisement popup, but I think I can work out the answer but I don't know how to logically explain it to my kids.


10 people can paint 60 houses in 120 days. How many houses can 5 people paint in 60 days

Homework Equations

No, that's all

The Attempt at a Solution

What a seem-to-be easy problem is not easy. (for me at least)

 

[genericusrnme]

Think about how you could represent this problem using straight lines

 

[Mark44]

10 people can paint 60 houses in 120 days.

So 1 person can paint 6 houses in 120 days.