It takes 1.5 meters of ribbon to wrap a cake box. After wrapping 26 cake boxes with a roll of ribbon, there is still 1.2 meters left. How long is this roll of ribbon?
包装一个蛋糕盒需要1.5米彩带，用一卷彩带包装了26个蛋糕盒后还剩1.2米，这卷彩带长多少米？
<gadget id="calculator">1.5 * 26</gadget>
<output>39</output>

<gadget id="calculator">39 + 1.2</gadget>
<output>40.2</output>

<result>40.2</result>