Master Lin processes a batch of parts, processing the total number (2/15) on the first day, processing (3/10) the total number on the second day, and can just continue processing from the 118th on the third day. How many parts are there in this batch?
林师傅加工一批零件，第一天加工总数的(2/15)，第二天加工总数的(3/10)，第三天刚好可以从第118个接着加工．这批零件有多少个？
<gadget id="calculator">118 - 1</gadget>
<output>117</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/15) + (3/10)</gadget>
<output>13/30 = around 0.433333</output>

<gadget id="calculator">117 / (13/30)</gadget>
<output>270</output>

<result>270</result>