square room is paved with rectangular floor tiles with a length of 6 decimeters and a width of 5 decimeters, which can be completely covered without any surplus (the bricks are all in one piece), what is the minimum square meter of this room?
一间正方形屋子，用长是6分米，宽是5分米的长方形地砖铺地，都能铺满而没有剩余(砖都是整块数)，这间屋子最少有多少平方米？
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>