ALEGEBRA
posted by HALIS .
The new school has exactly 1000 students and 1000 lockers.On the first day all the students meet outside and agree on the following plan: the first student will enter the school and open all the lockers.The second student will then enter the school and close every locker with an even number (2,4,6,8..).The third student will the reverse every third locker (3,6,9,12...).That is if the locker is closed,he/she will open it ,and if is open ,he/she will close it.The 4th student will then reverse every fourth locker and so on until all 1000 students in turn have entered the building and reversed the proper lockers.

A very old problem
Here is a great explanation
http://www.daniweb.com/forums/thread217790.html#
Respond to this Question
Similar Questions

Math
A new school has exactly 1,000 lockers and 1,000 students. the student meet outside the building and decide on this plan. The first student will enter and open al the lockers. The second student will enter and colse ever locker with … 
geometry
At Millock Highschool, there are 1,000 lockers and 1,000 students. The first day of school, all the students line up outside of the school and enter one at a time. The first student touches evry locker,the second student touches evry … 
Math 6th
Imagine there are 1000 lockers and 1000 students at school. The 1st student who comes through the school opens every locker as they enter the school. The 2nd student walks in and closes every other locker begining with locker number … 
Math
Newon Middle School has a hall with 500 lockers, all of which are closed. Five hundred students start down the hall. The first student opens every locker. The second student closes all the lockers that are multiples of 2. The third … 
9th grade
A new high school has just been completed. There are 1,000 lockers in the long hall of the school and they have been numbered from 1 to 1,000. During lunch, the 1,000 students decide to try an experiment.  The first student, student … 
algebra
the new school has exactly 1000 lockers and 1000 students. on the first day of school, the students meet outside the building and agree on the following plan: the first student will enter the school and open all of the lockers. the … 
algebra
the new school has exactly 1000 lockers and 1000 students. on the first day of school, the students meet outside the building and agree on the following plan: the first student will enter the school and open all of the lockers. the … 
Math
Reasoning Word Problem: A school's lockers are numbered 1100. One hundred students enter the school one at a time. The first student opens the lockers. The second student closes the evennumbered lockers. The third student either … 
Math Word Problem(PLEASE HELP NOW)
Reasoning Word Problem: A school's lockers are numbered 1100. One hundred students enter the school one at a time. The first student opens the lockers. The second student closes the evennumbered lockers. The third student either … 
Algrebra
A new high school has just been opened, with an enrollment of 1000 students. The school has 1000 lockers, numbered 1 to 1000, to accommodate them. On the first day of school all 1000 lockers are closed. The first student enters the …