A, B, and C work together to process a batch of parts. The ratio of the number of parts processed by A to the total number of parts processed by B and C is 1:2. A and B processed a total of 105 parts, and B processed this (1/4) of the total number of parts in the batch, how many parts are there in this batch?
甲、乙、丙三人共同加工一批零件，甲加工的零件数与乙、丙两人加工零件总数的比是1：2，甲、乙两人共加工了105个零件，乙加工了这批零件总数的(1/4)，这批零件一共有多少个？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) + (1/4)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">105 / (7/12)</gadget>
<output>180</output>

<result>180</result>