A piece of fabric can be used to make 10 coats or 15 pairs of trousers. Master Wang first made 5 pairs of trousers out of this piece of fabric, and the rest had to be cut into sets. How many sets can he make?
一块布料，可做10件上衣或15条裤子．王师傅先用这块布料做了5条裤子，剩下的要成套裁做，还能做多少套？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 5</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) / (1/6)</gadget>
<output>4</output>

<result>4</result>