It takes 50 pieces to pave the floor with square bricks with a side length of 3dm, and how many pieces are needed to pave the floor with square bricks with a side length of 5dm? (Solve with ratio)
用边长3dm的方砖铺地需50块，改用边长5dm的方砖铺，需要多少块？(用比例解)
<gadget id="calculator">3 * 3 * 50</gadget>
<output>450</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">450 / 25</gadget>
<output>18</output>

<result>18</result>