The farm raises 1028 chickens this year, and if it raises another 172 chickens, it will be exactly 1.5 times the number of chickens raised last year. How many chickens did you raise last year?
养殖场今年养鸡1028只，如果再养172只，那么正好是去年养鸡只数的1.5倍．去年养鸡多少只？
<gadget id="calculator">1_028 + 172</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 1.5</gadget>
<output>800</output>

<result>800</result>