A fort of 2000 soldiers has provisions for 50 days. After 10 days some of them left and the food was now enough for the same period of 50 days as before. How many of them left?	Select
A) 400  B) 197  C) 278  D) 270  E) 279
2000 ---- 50   2000 ---- 40   x ----- 50   x*50 = 2000*40   x=1600   2000   -------   400   400nswer: 400
<result>A</result>
A fort of 2000 soldiers has provisions for 50 days. After 10 days some of them left and the food was now enough for the same period of 50 days as before. How many of them left?