Xinxin Garment Factory wants to produce a batch of school uniforms. The ratio of the number of sets completed in the first week to the total number of sets of this batch of school uniforms is 1:4. If 250 more sets are produced, half of this batch of school uniforms will be completed. How many sets of school uniforms are there in total?
欣欣服装厂要生产一批校服，第一周完成的套数与这批校服的总套数的比是1：4．如果再多生产250套，就完成这批校服的一半．这批校服共多少套？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">250 / (1/4)</gadget>
<output>1_000</output>

<result>1_000</result>