A piece of iron wire used up 20 meters, which is 5 meters less than the remaining three times. How many meters of this iron wire are left?
一根铁丝用去20米，比剩下的3倍少5米，这根铁丝还剩多少米？
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 / 3</gadget>
<output>25/3 = around 8.333333</output>

<result>25/3 = around 8.333333</result>