The workshop originally planned to complete a batch of machine installation tasks in 40 days, but actually installed 10 more machines per day, and the task was completed in 30 days. How many machines were originally planned to be installed per day? (Solution of column equations)
车间原计划40天完成一批机器安装任务，实际每天多装10台，30天就完成任务，原计划每天安装多少台？(列方程解题)
<gadget id="calculator">10 * 30</gadget>
<output>300</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">300 / 10</gadget>
<output>30</output>

<result>30</result>