There is a rectangular room with a length of 45 decimeters and a width of 35 decimeters. Square floor tiles should be used to pave the floor. The side length of the square bricks is 5 decimeters. How many square floor tiles are needed to complete the paving?
有一底面是长方形的房间，长45分米，宽35分米，要用正方形地砖铺地，方砖的边长是5分米，至少需要多少块正方形地砖正好铺完？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">35 / 25</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">45 * (7/5)</gadget>
<output>63</output>

<result>63</result>