Hope Middle School will plant 1540 trees this year, which is 5/6 more than last year. How many trees were planted last year?
希望中学今年栽树1540棵，比去年多栽(5/6)，去年栽树多少棵？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 + (5/6)</gadget>
<output>11/6 = around 1.833333</output>

<gadget id="calculator">1_540 / (11/6)</gadget>
<output>840</output>

<result>840</result>