walkway is 120 meters long, which is 4 times its width. If square bricks with a side length of 15 cm are used to pave the floor, how many bricks are needed?
一条走道长120米，是宽的4倍，如果用边长15厘米的方砖铺地，需要多少块砖？
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * (3/20)</gadget>
<output>9/400 = around 0.0225</output>

<gadget id="calculator">120 / (9/400)</gadget>
<output>16_000/3 = around 5_333.333333</output>

<gadget id="calculator">30 * (16_000/3)</gadget>
<output>160_000</output>

<result>160_000</result>