I have the answers in the back, but need help setting this up:
On a scale that measures the intensity of a certain phenomenon, 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?
Not sure the answer is what it is...
Official GMAT, 11e, #99
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- jayhawk2001
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To solve by induction, you can directly do
Intensity at level n = 10^n * intensity-at-level-1
Alternatively,
Intensity at 4 = 10 * intensity at 3
Intensity at 5 = 10^2 * intensity at 3
...
Intensity at 8 = 10^5 * intensity at 3
Intensity at level n = 10^n * intensity-at-level-1
Alternatively,
Intensity at 4 = 10 * intensity at 3
Intensity at 5 = 10^2 * intensity at 3
...
Intensity at 8 = 10^5 * intensity at 3