If the number of rows of a movie theater is reduced (1/40), how much each row of seats must be increased to keep the total number of seats constant.
一个电影院的排数减少(1/40)，每排座位必须增加多少，才能使总座位数保持不变．
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 - (1/40)</gadget>
<output>39/40 = around 0.975</output>

<gadget id="calculator">1 / (39/40)</gadget>
<output>40/39 = around 1.025641</output>

<gadget id="calculator">(40/39) - 1</gadget>
<output>1/39 = around 0.025641</output>

<gadget id="calculator">(1/39) / 1</gadget>
<output>1/39 = around 0.025641</output>

<result>1/39 = around 0.025641</result>