Dimitri saw 2 x 6 = <<2*6=12>>12 wheels on the bicycles.

He saw 15 x 3 = <<15*3=45>>45 wheels on the tricycles.

He saw a total of 12 + 45 = <<12+45=57>>57 wheels.

# Answer

57
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
At the park, Dimitri saw families riding bicycles and tricycles. Bicycles have two wheels and tricycles have three wheels.  6 adults were riding bicycles and 15 children were riding tricycles.   How many wheels did Dimitri see at the park?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
57
At the park, Dimitri saw families riding bicycles and tricycles. Bicycles have two wheels and tricycles have three wheels.  6 adults were riding bicycles and 15 children were riding tricycles.   How many wheels did Dimitri see at the park?
train