A brick is 20 centimeters long and 12 centimeters wide. How many bricks like this are needed to form a square on flat ground?
一块砖长20厘米，宽12厘米，在平地上拼一个正方形至少要这样的砖多少块．
<gadget id="calculator">2 * 2 * 5 * 3</gadget>
<output>60</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">60 / 240</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<result>15</result>