Xinhua Primary School has 945 students this year, an increase of 5% over last year. How many students did Xinhua Primary School have last year?
新华小学今年有学生945人，比去年增加了5%，新华小学去年有学生多少人？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">945 / (21/20)</gadget>
<output>900</output>

<result>900</result>