An orchard has harvested 720 tons of apples this year and has sold them (5/6). How many tons are left?
一果园今年收苹果720吨，已经出售(5/6)，还剩多少吨？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">720 * (1/6)</gadget>
<output>120</output>

<result>120</result>