A road has been built for 170 meters, which is 50 meters longer than the unbuilt road (3/4). How long is the unbuilt road?
修一条路，已经修了170米，比没修的(3/4)多50米，没修的路有多长？
<gadget id="calculator">170 - 50</gadget>
<output>120</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 / (3/4)</gadget>
<output>160</output>

<result>160</result>