There is a rectangle whose perimeter is 68 centimeters, whose length is (2/5) decimeters, and how many centimeters is its width?
有一个长方形，周长是68厘米，已知长是(2/5)分米，宽是多少厘米？
<gadget id="calculator">68 / 2</gadget>
<output>34</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<gadget id="calculator">34 - 4</gadget>
<output>30</output>

<result>30</result>