Tianwang Elementary School plans to use 230 tons of water for the whole year this year, saving 20 tons of water compared with last year.
天王小学今年计划全年用水230t，比去年节约用水20t，今年计划比去年节约用水多少．
<gadget id="calculator">230 + 20</gadget>
<output>250</output>

<gadget id="calculator">20 / 250</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>