A road has been built for 15 kilometers, and the remaining road is 5 kilometers shorter than the 4 times that it has been built. How many kilometers are left?
一条路已修了15千米，剩下的比已修的4倍少5千米．剩下多少千米？
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 - 5</gadget>
<output>55</output>

<result>55</result>