The money to buy 7 pairs of shoes can buy 5 coats, each coat is 140 yuan, how much is each pair of shoes?
买7双鞋的钱可以买5件大衣，每件大衣140元，每双鞋子多少钱？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">140 * (5/7)</gadget>
<output>100</output>

<result>100</result>