Li Qiang's living expenses in June were 255 yuan, which was 15% less than the plan. How much did he save?
李强六月份的生活费为255元，比计划节省了15%，节省了多少元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">255 / (17/20)</gadget>
<output>300</output>

<gadget id="calculator">300 * (3/20)</gadget>
<output>45</output>

<result>45</result>