Uncle Li raised 4,500 chickens this year, which is 100 fewer than twice the number of chickens raised last year. How many chickens were raised in two years?
李大伯今年养鸡4500只，比去年养鸡数的2倍少100只，两年共养鸡多少只？
<gadget id="calculator">4_500 + 100</gadget>
<output>4_600</output>

<gadget id="calculator">4_600 / 2</gadget>
<output>2_300</output>

<gadget id="calculator">2_300 + 4_500</gadget>
<output>6_800</output>

<result>6_800</result>