Each part is 30/6 = <<30/6=5>>5 meters long.

Since Liam used 4 parts, then he used 5 x 4 = <<4*5=20>>20 meters of the ribbon.

So, 30 - 20 = <<30-20=10>>10 meters of ribbon is not used.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Isaac cut his 30 meters ribbon into 6 equal parts. He then used 4 parts of the ribbon. How many meters of ribbon are not used?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
Isaac cut his 30 meters ribbon into 6 equal parts. He then used 4 parts of the ribbon. How many meters of ribbon are not used?
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