There is a batch of wall bricks, each brick is 30 cm long and 25 cm wide. At least how many of these bricks are needed to pave a square?
有一批墙面砖，每块砖的长是30厘米，宽25厘米．至少用多少这样的砖才能铺成一个正方形？
<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 * (1/5)</gadget>
<output>6</output>

<gadget id="calculator">5 / 30</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>