If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ?
The total length cut from the 51-meter ribbon is 100 x 15 centimeters = 
<gadget id="calculator">100*15</gadget>
<output>1_500</output>
1500 centimeters.
Since 1 meter is equal to 100 centimeters, then 1500 centimeters is equal to 1500/100 = 
<gadget id="calculator">1500/100</gadget>
<output>15</output>
15 meters.
Therefore, 51 - 15 = 
<gadget id="calculator">51-15</gadget>
<output>36</output>
36 meters of ribbon remains.

<result>36</result>