The birds eat this many tomatoes: 21 / 3 = <<21/3=7>>7 tomatoes.

There are this many tomatoes left on the plant: 21 - 7 = <<21-7=14>>14 tomatoes.

# Answer

14
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are 21 cherry tomatoes on the tomato plant.  2 birds eat one-third of the tomatoes.  How many are still left on the tomato plant?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
14
There are 21 cherry tomatoes on the tomato plant.  2 birds eat one-third of the tomatoes.  How many are still left on the tomato plant?
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