Find the number of bicycles and tricycles Help for my son.  My math is a bit rusty and I'm trying to remember how to go about answering this question:  "There are 3 times as many bicycles in the playground as there are tricycles.  There is a total of 81 wheels.  What is the total number of bicycles and tricycles in the playground?"     

Without using equations and variables:

There are 3 times as many bicycles in the playground as there are
  tricycles.

Make groups of three bicycles and one tricycle each. Each group consists of 4 toys and has 9 wheels.

There is a total of 81 wheels. 

There are 9 groups and thus 36 toys on the playground.
