What is the total length in centimeters after gluing 4 pieces of paper with a length of 20 centimeters together? (glue is 2 cm)
将长度都是20厘米的4张纸条粘连起来后全长是多少厘米？(粘合处为2厘米)
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">80 - 6</gadget>
<output>74</output>

<result>74</result>