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On a scale that measures the intensity of a certain

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Manager
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New post 24 Sep 2006, 23:51
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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 much 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

Could not get to the answer, could you explain your workings, will post OA later.
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New post 25 Sep 2006, 09:16
I get C

every reading it increases 10 fold.
Assuming :
1 -1
2 -10
3-100
4 - 10^3
5 - 10^4


8 - 10^ 7

Question asks how many times as great: 10^5
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New post 25 Sep 2006, 11:20
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 much 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

LET THE INTENISTY OF (N+1) = 10X
// // // // // (N) = X

READING THREE INTENISTY IS = X
4 = 10X
5 = 10*10X



8 = 10^5X

THUS IT IS C IE 10^5 AS MUCH AS THE INTENISTY AT 3
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New post 25 Sep 2006, 11:21
thanks

offical answer C
  [#permalink] 25 Sep 2006, 11:21
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