500 ps test27 #15

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Fri Apr 20, 2007 9:09 am

Hi,

The answer is C) and I think the process is 10^8 - 10^3, but I could not figure out how n+1 is related to the answer... Can anyone explain?

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Source: Beat The GMAT — Problem Solving | Fri Apr 20, 2007 9:09 am

gabriel: Legendary Member; Posts: 986; Joined: Wed Dec 20, 2006 11:07 amFollowed by: 1 member; Location: India; Thanked: 51 times

Re: 500 ps test27 #15

by gabriel » Fri Apr 20, 2007 9:32 am

dunkin77 wrote:Hi,

The answer is C) and I think the process is 10^8 - 10^3, but I could not figure out how n+1 is related to the answer... Can anyone explain?

ok what the q basicall y says is that if on the scale at n the reading is say "a " .. then on the smae scale the reading for n+1 wuld be "10*a" ...

... so applying this logic to theq .. if the reading at 3 is "x" ... then the reading at 4,5,6,7,8, is 10*x,10^2*x,10^3*x,10^4*x,10^5*x respectively .. so as u can see the reading at 8 is greater than the 3rd by 10^5 ...

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