Xiaohong’s house has a living room with a length of 5 meters and a width of 4.5 meters. The floor is paved with square bricks with an area of 0.25 square meters. How many square bricks are needed?
小红家有一个客厅长5米，宽4.5米，用面积0.25平方米的方砖铺地，需要多少块这样的方砖？
<gadget id="calculator">5 / 0.25</gadget>
<output>20</output>

<gadget id="calculator">4.5 * 20</gadget>
<output>90</output>

<result>90</result>