The garment factory processes 1500 sets of school uniforms, and it takes 3 days to complete (1/5), and the rest will take (how many) days to complete.
服装厂加工1500套校服，3天完成了(1/5)，剩下的还要(多少)天才能完成．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / (1/5)</gadget>
<output>15</output>

<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<result>12</result>