The room you sleep in is 5 meters long and 4 meters wide. If half of the room is paved with square bricks with a side length of 50 cm, how many bricks are needed?
你睡的房间长5米宽4米，如果用边长50厘米的方砖铺一半，需要多少块？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">10 / (1/4)</gadget>
<output>40</output>

<result>40</result>