Problem Solving question #98 in Official Guide for GMAT Rev.

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jesscur2020: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Mon Jan 03, 2011 1:38 pm

by jesscur2020 » Sat Sep 17, 2011 3:30 pm

Can someone better explain the answer to question 98 in The official Guide for GMAT Review:

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?
The answer is 10^5, but I really don't understand the solution given to get that answer.

Any feedback is appreciated,
Thank you

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Source: Beat The GMAT — Problem Solving | Sat Sep 17, 2011 3:30 pm

edvhou812: Master | Next Rank: 500 Posts; Posts: 143; Joined: Sat Nov 06, 2010 9:06 pmFollowed by: 1 member; Thanked: 10 times

by edvhou812 » Sat Sep 17, 2011 5:40 pm

n+1=10n
n+2=100n or (10^2)n
n+3=(10^3)n etc

Question asks about n+3, and n+8. n+8=(10^8)n
10^(8-3)=10^5

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