piece of cloth can be used to make 8 coats or 10 pairs of trousers. Now that one pair of trousers has been made, the rest needs to be made as a set. How many suits can be made?
一匹布，可以做8件上衣或者10条裤子，现在已经做了一条裤子，剩下的要成套的做，可以做多少套衣裤．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/10) / (9/40)</gadget>
<output>4</output>

<result>4</result>