set of clothing is 280 yuan, and the price of the trousers accounts for (2/5) of the price of the jacket. How much is the jacket? (equation)
一套服装280元，裤子的价钱占上衣价钱的(2/5)，上衣多少钱？(方程)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">280 / (7/5)</gadget>
<output>200</output>

<result>200</result>