Master Jiang processes a batch of parts, 390 of which are 60 less than the planned number (3/7). How many parts does Master Jiang plan to process?
江师傅加工一批零件，已经加工了390个，比计划个数的(3/7)少60个．江师傅计划加工多少个零件？
<gadget id="calculator">390 + 60</gadget>
<output>450</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">450 / (3/7)</gadget>
<output>1_050</output>

<result>1_050</result>