Xiaoling is in charge of the house this month, and the water bill spent this month is 240 yuan, which is 25% less than last month. How much was the water bill last month?
小玲这个月当家，这个月支出的水费是240元，比上月节约了25%，上月的水费是多少元？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">240 / (3/4)</gadget>
<output>320</output>

<result>320</result>