Guangming Primary School carried out water conservation activities. This month's water fee was 205 yuan, which was 45 yuan less than last month. How much was saved?
光明小学开展节约用水活动，这个月水费205元，比上月节约45元，节约了多少．
<gadget id="calculator">205 + 45</gadget>
<output>250</output>

<gadget id="calculator">45 / 250</gadget>
<output>9/50 = around 0.18</output>

<result>9/50 = around 0.18</result>