garment factory uses a batch of cloth to process clothes. If they are all tops, they can make 30 sets, and if they are all bottoms, they can make 40 sets. Now use these fabrics to make 5 pieces of bottoms first, and make the rest into suits. How many sets can you make?
服装厂用一批布加工服装，若都做上装，可做30套，若都做下装，可做40套．现在用这些布先做5件下装，剩下的都做成套装，可做多少套？
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/40) * 5</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) + (1/40)</gadget>
<output>7/120 = around 0.058333</output>

<gadget id="calculator">(7/8) / (7/120)</gadget>
<output>15</output>

<result>15</result>