Assemble a batch of computers, 40% of the total has been installed, and the rest are 300 more than the installed ones. How many computers are there in total?
组装一批电脑，已装了总数的40%，剩下的比已装的多300台．这批电脑共有多少台？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 / (1/5)</gadget>
<output>1_500</output>

<result>1_500</result>