Huanhuan and Xiaoxiao took a measuring tape with a broken end and measured the length of a piece of wood. One end of the wood is on the 3-meter scale and the other end is on the 6-meter scale. How long is this log?
欢欢和笑笑拿了一个开头断了一截的卷尺，量一根木头的长度．木头的一端在3米的刻度上，另一端在6米的刻度上．这根木头长多少？
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<result>3</result>