Hongqi Primary School has 459 students this year, 15% less than last year. ． How many students did Hongqi Primary School have last year?
红旗小学今年有学生459人，比去年减少了15%．．红旗小学去年有学生多少人？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">459 / (17/20)</gadget>
<output>540</output>

<result>540</result>