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shibal: Master | Next Rank: 500 Posts; Posts: 345; Joined: Wed Mar 18, 2009 6:53 pm; Location: Sao Paulo-Brazil; Thanked: 12 times; GMAT Score:660

by shibal » Thu Jun 25, 2009 6:45 pm

10^8 – 10^2 / 10^7 – 10^3 =?

oa 10

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Source: Beat The GMAT — Problem Solving | Thu Jun 25, 2009 6:45 pm

ssmiles08: Master | Next Rank: 500 Posts; Posts: 472; Joined: Sun Mar 29, 2009 6:54 pm; Thanked: 56 times

Re: 10

by ssmiles08 » Thu Jun 25, 2009 6:56 pm

shibal wrote:10^8 – 10^2 / 10^7 – 10^3 =?

oa 10

10^8 – 10^2 = 10^2*(10^6-1)

10^7 – 10^3 = 10^3*(10^4-1)

notice that (10^6-1) and (10^4-1) is 10^6 and 10^4 b/c subtracting 1 is trivial.

dividing will give you 10^2/10 = 10.

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