The master processed 480 parts, 60 fewer than twice as many as the apprentice. How many parts did the apprentice process? (solution by equation)
师傅加工了480个零件，比徒弟的2倍少60个．徒弟加工了多少个零件？(用方程解)
<gadget id="calculator">60 + 480</gadget>
<output>540</output>

<gadget id="calculator">540 / 2</gadget>
<output>270</output>

<result>270</result>