Master Zhang welded two iron bars with a length of 2.4 meters, and the length of the joint was 0.03 meters. How long is the iron bar after welding?
张师傅把两根长度都是2.4米的铁条焊接起来，接口处长0.03米．焊接好后的铁条长多少米？
<gadget id="calculator">2.4 - 0.03</gadget>
<output>2.37</output>

<gadget id="calculator">2.4 + 2.37</gadget>
<output>4.77</output>

<result>4.77</result>