A factory planned to make a batch of parts. The original plan was to complete the task in 10 days, but the actual average daily production was 15 more than the original plan. As a result, the task was completed 3 days ahead of schedule. How many parts did the factory originally plan to make?
某工厂计划做一批零件，原计划10天完成任务，实际每天平均比原计划多做15个，结果提前3天完成任务．该工厂原计划做零件多少个？
<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<gadget id="calculator">150 - 45</gadget>
<output>105</output>

<gadget id="calculator">3 - 10</gadget>
<output>-7</output>

<gadget id="calculator">10 + (-7)</gadget>
<output>3</output>

<gadget id="calculator">105 / 3</gadget>
<output>35</output>

<result>35</result>