There is a batch of bricks, each brick is 45 cm long and 30 cm wide. At least how many of these bricks are needed to form a square?
有一批砖，每块砖长45厘米，宽30厘米．至少用多少块这样的砖才能铺成一个正方形？
<gadget id="calculator">2 * 3 * 3 * 5</gadget>
<output>90</output>

<gadget id="calculator">90 / 45</gadget>
<output>2</output>

<gadget id="calculator">90 / 30</gadget>
<output>3</output>

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

<result>6</result>