There are two ropes, one 16 meters long and the other 20 meters long. Now we need to cut them into small pieces of the same length, each piece should be as long as possible, and there is no surplus. How many meters is each piece of rope?
有两根绳子，一根长16米，另一根长20米．现在要把它们剪成同样长的小段，每段要尽可能长，且没有剩余．每段绳子长多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>