Ten snakes cross a road. How many legs are there on the road?

Explanation

A spider has eight legs, so five spiders have 5x8 = 40 legs. A horse has four legs, so three horses have 3x4 = 12 legs. A snake has no legs, so ten snakes have 10x0 = 0 legs. A human has two legs, so a family with two adults and three children have 5x2 = 10 legs.