When transporting cement to the construction site, 170 tons of cement were shipped in the morning, and 85 tons were shipped in the afternoon, twice as much as in the morning. How much more tons are shipped in the afternoon than in the morning?
建筑工地运水泥，上午运来水泥170吨，下午运来的比上午运的2倍还多85吨．下午比上午多运多少吨？
<gadget id="calculator">170 * 2</gadget>
<output>340</output>

<gadget id="calculator">85 - 170</gadget>
<output>-85</output>

<gadget id="calculator">340 + (-85)</gadget>
<output>255</output>

<result>255</result>