May 1, 2012

Problem of the Week

for Tuesday, May 1, 2012

Proposed by Alex J. and Charlotte Ka. in the 7th grade

I have a farm on which each day 1 pig leaves. Every 4 days, 2 pigs come back, every 9 days 3 additional pigs leave, every 16 days 4 additional pigs return, every 25 days 5 additional pigs leave, and every 36 days, 6 additional pigs return. If I start with 200 pigs, how many pigs will I have after 100 days?

Winners of the pig challenge