Rectangular bricks are 42 cm long and 28 cm wide. How many bricks are needed to pave a large square floor with this kind of bricks?
长方形砖长42厘米，宽28厘米，用这种砖铺成一块大正方形的地，至少需要多少块砖．
<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>