Sanxin Primary School’s water and electricity bill in October was 480 yuan, which was 25% less than that in September. How much yuan was saved?
三信小学十月份的水电费是480元，比九月份节约了25%，节约了多少元？
<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">480 / (3/4)</gadget>
<output>640</output>

<gadget id="calculator">640 - 480</gadget>
<output>160</output>

<result>160</result>