It takes 450 tons of water to make 1 ton of paper. A paper mill produced 625 tons of paper last year. How many tons of water were used to make the paper?
制造1吨纸，需要450吨水．某造纸厂去年生产纸625吨，制造这些纸时用去的水有多少吨？
<gadget id="calculator">450 / 1</gadget>
<output>450</output>

<gadget id="calculator">450 * 625</gadget>
<output>281_250</output>

<result>281_250</result>