There is a batch of floor tiles, each of which is 5 decimeters long and 3 decimeters wide, at least how many such floor tiles are needed to form a square?
有一批地砖，每块长5分米、宽3分米，至少要用多少块这样的地砖才能铺成一个正方形？
<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">3 * (5/3)</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>