Master Wang processes a batch of parts, and it is known that 35% of the total number has been completed. If 15 more parts are processed, half of the total number will be completed. How many parts will Master Wang process in total?
王师傅加工一批零件，已知完成了总数的35%，如果再加工15个，就完成了总数的一半，王师傅一共要加工多少个零件？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">15 / (3/10)</gadget>
<output>50</output>

<result>50</result>