Use rectangular planks 6 cm long and 4 cm wide to form a square, how many such planks are needed at least.
用长6厘米，宽4厘米的长方形木板拼成一个正方形，最少需要用这样的木板多少块．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>