The garment factory produces a batch of school uniforms, and completed 20% of the total in the first 10 days. If it produces 150 more sets, it can complete half of this batch of school uniforms. How many sets of school uniforms are there in total?
服装厂生产一批校服，前10天完成了总数的20%，如果再生产150套，正好可以完成这批校服的一半．这批校服共有多少套？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">150 / (3/10)</gadget>
<output>500</output>

<result>500</result>