A classroom needs 300 bricks with a side length of 5dm to pave the floor. If it is replaced with square bricks with a side length of 10dm, how many bricks are needed at least? (equation solution)
一间教室，用边长为5dm的地砖铺地面，需要300块，若改用边长为10dm的方砖，至少需要多少块？(方程解答)
<gadget id="calculator">5 * 5 * 300</gadget>
<output>7_500</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">7_500 / 100</gadget>
<output>75</output>

<result>75</result>