Last year, 940 fry were stocked in the pond of Hehua Village. The number of fry stocked this year is 3 times that of last year. About how many more tails were stocked this year than last year?
荷花村的池塘里去年放养了鱼苗940尾．今年放养的鱼苗是去年的3倍．今年比去年大约多放养了多少尾？
<gadget id="calculator">940 * 3</gadget>
<output>2_820</output>

<gadget id="calculator">2_820 - 940</gadget>
<output>1_880</output>

<result>1_880</result>