The school holds an art exhibition. There are 80 paintings, less than calligraphy works (2/7). How many calligraphy works are there?
学校举办美术作品展览．绘画作品有80件，比书法作品少(2/7)．书法作品有多少件？
<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">80 / (5/7)</gadget>
<output>112</output>

<result>112</result>