Ms. Wang buys goods. With the money she brings, she can buy 8 pieces only for tops, and 10 pairs for only trousers. Now that she has bought a pair of trousers, how many sets of the same clothes can she buy with the rest of the money?
王女士进货，所带钱只买上衣可买8件，只买裤子可买10条，现在已买一条裤子，余下的钱配套买，还可以买多少套同样的衣服？
<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>