A contractor is doing work for 7 days at your home. You have a gold bar that is worth $7000. You need to pay him $1000 every day and $7000 in total. You have to pay him in gold by using the gold bar. How can you pay him $1000 worth of gold everyday by cutting the gold bar only twice?
By cutting the gold bar twice, you can have 3 pieces of gold.
Let the gold bar pieces be GB1, GB2 and GB3. They are worth $1000, $2000 and $4000 respectively.
Day1: Give GB1
Day2: Take GB1, Give GB2
Day3: Give GB1
Day4: Take GB1, GB2 and give GB3
Day5: Give GB1
Day6: Take GB1, Give GB2
Day7: Give GB1