For an office, it takes 150 pieces to pave the floor with square bricks with a side length of 0.3 meters. If the floor is paved with square bricks with a side length of 0.5 meters, how many pieces are needed?
一间办公室，用边长0.3米的方砖铺地需要150块，若改用边长0.5米的方砖来铺，需要多少块？
<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">150 / 0.25</gadget>
<output>600</output>

<gadget id="calculator">0.3 * 0.3 * 600</gadget>
<output>54</output>

<result>54</result>