How many colored tiles are required to form a square with a length of 20 cm and a width of 15 cm?
用长为20厘米，宽为15厘米的彩色瓷砖，铺成一个正方形至少需要多少块？
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">60 / 300</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 * (1/5)</gadget>
<output>12</output>

<result>12</result>