A and B work together to process a batch of parts, which takes 25 days to complete. First, A alone processes for 10 days, and then B alone processes for 30 days. At this time, a total of (3/4) of the batch of parts has been processed, and B can process each day What fraction of this batch of parts is processed?
甲、乙两人合作加工一批零件，需25天完成，先由甲独自加工10天，再由乙单独加工30天，这时共加工了这批零件的(3/4)，乙每天能加工这批零件的几分之几？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/25) * 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">(7/20) / 20</gadget>
<output>7/400 = around 0.0175</output>

<result>7/400 = around 0.0175</result>