The perimeter of a rectangle is 100 cm and its length is 30 cm. Now add 10 cm to its length and width. What is the perimeter of the rectangle in cm?
一个长方形的周长是100厘米它的长是30厘米现在使它的长、宽各增加10厘米，这时长方形的周长是多少厘米．
<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<gadget id="calculator">20 + 10</gadget>
<output>30</output>

<gadget id="calculator">40 + 30</gadget>
<output>70</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<result>140</result>