Skip Discover Education Main Navigation

Favorites
Browse the Brain Boosters Gallery

 

  Number & Math Play

Walking the Dogs
 
Q A group of kids got together and started a dog-walking business. They got lots of clients right away, so that when they all walked their dogs together, there were twelve heads and forty legs. How many kids and how many dogs were out walking?
 
 
A If all 12 heads belonged to kids, there would be 24 legs (2 legs for each head). But there are 40 legs. That leaves 16 legs, or 8 pairs of legs that must belong to dogs. So there are 8 dogs. Subtract 8 from 12 (since everyone has only one head), and that leaves 4 kids.