If 15 identical squares have a total perimeter of 240 centimeters, put them together to form a rectangle. What is the maximum perimeter of this rectangle in centimeters?
15个相同的正方形，周长总和是240厘米，把他们拼成一个长方形，这个长方形的周长最多是多少厘米．
<gadget id="calculator">240 / 15 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<gadget id="calculator">4 + 60</gadget>
<output>64</output>

<gadget id="calculator">64 * 2</gadget>
<output>128</output>

<result>128</result>