The perimeter of a rectangle is 70 cm, the width is 15 cm, what is the length in decimeters?
一个长方形的周长是70厘米，宽是15厘米，长是多少分米？
<gadget id="calculator">70 / 2</gadget>
<output>35</output>

<gadget id="calculator">35 - 15</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<result>2</result>