there are 250 zebras in a wildlife reserve. the rangers move them to a new reserve. in the first month, the rangers moved 20 zebras. In each month after that, the rangers moved 10 more zebras than in the month before. How many months did it take to move all the zebras? help

Question

there are 250 zebras in a wildlife reserve. the rangers move them to a new reserve. in the first month, the rangers moved 20 zebras. In each month after that, the rangers moved 10 more zebras than in the month before. How many months did it take to move all the zebras?  help

anonymous · Answer

count it out
20+30+40+50+...

anonymous · Answer

250-20
230
230-30
200
200-40
160
160-60
110
110-70
40
110-80
-40
so 6 months
pretty sure that's it