A rectangular piece of paper is 42 cm long and 28 cm wide, at least how many sheets of this rectangular paper are used to form a square.
一种长方形的纸长42厘米，宽28厘米，至少要用多少张这种长方形的纸才能拼成一个正方形．
<gadget id="calculator">84 / 42</gadget>
<output>2</output>

<gadget id="calculator">84 / 28</gadget>
<output>3</output>

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

<result>6</result>