To make 48 parts, the worker made 25% of the total number on the first day, and then made 3/8 of the total number on the second day. How many parts should be done on the third day to complete the task?
要做48个零件，工人第一天做了总数的25%，第二天又做了总数的(3/8)，第三天要做多少个才能完成任务？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (1/4) - (3/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">48 * (3/8)</gadget>
<output>18</output>

<result>18</result>