a piece of paper 0.001in thick is cut in half

Question

a piece of paper 0.001in thick is cut in half, and the two halves are placed one on top of the other. The stack of two is then cut in half, and one pile is placed on top of the other to create a stack of four. How many times must this process be repeated to create a stack of paper slightly more than a mile high?

Answer 1

0.001 2ⁿ = 5280/2  x 12 = 31680 inch

 

2ⁿ = 31680/.001 = 31680000

 

n log 2 = log 31680000

 

n x .30103 = 7.5

n = 24.9 = 25 times