A sweater is now priced at 150 yuan, which is cheaper than the original price (2/7). How much is the original price?
一件毛衣现在售价150元，比原价便宜(2/7)，原价多少钱？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">150 / (5/7)</gadget>
<output>210</output>

<result>210</result>