It takes Zhao Lanlan 4 days and Zhao Wenwen 5 days to complete the same job alone. Zhao Lanlan's work efficiency is as much as Zhao Wenwen's work efficiency
单独完成同一件工作，赵兰兰要4天，赵文文要5天，赵兰兰的工效是赵文文的工效的多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) / (1/5)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>