The length of a rectangle is 70 cm, and the width is 20 cm shorter than the length, what is the circumference in decimeters?
一个长方形的长是70厘米，宽比长短20厘米，周长是多少分米？
<gadget id="calculator">70 - 20</gadget>
<output>50</output>

<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">120 * (1/5)</gadget>
<output>24</output>

<result>24</result>