There are some rectangular pieces of paper with a length of 6 cm and a width of 5 cm. At least how many of these pieces of paper are needed to form a square?
有一些长6厘米、宽5厘米的长方形纸片，至少需要多少张这样的纸片才能拼成一个正方形？
<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>