Use rectangular wooden strips with a length of 14 cm and a width of 6 cm to form a square. At least how many pieces of such wooden strips should be used.
用长14厘米，宽6厘米的长方形木条拼成正方形，至少要用这样的木条多少块．
<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">42 / 14</gadget>
<output>3</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>