fertilizer factory produces 2,840 tons of fertilizer this year, which is 40 tons more than twice that of last year. How many tons of fertilizer did you produce last year?
一个化肥厂，今年生产化肥2840吨，比去年的2倍多40吨．去年生产化肥多少吨？
<gadget id="calculator">2_840 - 40</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 / 2</gadget>
<output>1_400</output>

<result>1_400</result>