Aunt Yu processed a batch of parts. On the first day, she processed (3/10) of the total number, but she processed less (1/15) of the total number than on the second day. What fraction of the total number did Aunt Yu process in two days?
于阿姨加工一批零件，第一天加工了总数的(3/10)，比第二天少加工了总数的(1/15)，于阿姨两天一共加工了总数的几分之几？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(1/15) + (3/10) + (3/10)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>