This year's Teacher's Day, the number of excellent teachers commended by Jianghai Education Bureau increased by 50 compared with last year, an increase of (1/5) compared with last year. How many outstanding teachers were honored by the Education Bureau last year?
今年教师节，江海市教育局表彰的优秀教师比去年增加了50名，比去年增加了(1/5)．去年教育局表彰了多少名优秀教师？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 / (1/5)</gadget>
<output>250</output>

<result>250</result>