A piece of cloth, only for jackets, can be made into 15 pieces, and only made of trousers, can be made into 10 pieces. How many sets of such clothes can be made from this piece of cloth?
一段布，只做上衣，可做15件，只做裤子，可做10条，求这段布可做几套这样的衣服？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

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

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

<result>6</result>