This is from OG 11:
On a scale that measures the intensity of a certain pheonomeon, a reading of n+1 corresponds to an intensity that is 10 times the intensity corresponding to a reading of n. On that scale the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3?
A) 5
B)50
C) 10^5
D) 5^10
E) 8^10 - 3^10
What is it about? Even they give the solution I have now idea for what lock this key is...help