The total length cut from the 51-meter ribbon is 100 x 15 centimeters = <<100*15=1500>>1500 centimeters.

Since 1 meter is equal to 100 centimeters, then 1500 centimeters is equal to 1500/100 = <<1500/100=15>>15 meters.

Therefore, 51 - 15 = <<51-15=36>>36 meters of ribbon remains.

# Answer

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<|im_start|>system
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<|im_start|>user
If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
36
If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ?
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