The school used 600 tons of water last month, and it saved (2/15) this month compared with last month. How many tons of water does the school use this month?
学校上个月用水600吨，这个月比上个月节约(2/15)，这个月学校用水多少吨？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 - (2/15)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">600 * (13/15)</gadget>
<output>520</output>

<result>520</result>