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# 8 years ago, George was half as old as Sarah. Sarah is now

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Re: 8 years ago, George was half as old as Sarah. Sarah is now [#permalink]
all of us did your thought :DD here on gmat club.

Ok but this is a simple question on gmat land......practice is the key.
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Re: 8 years ago, George was half as old as Sarah. Sarah is now [#permalink]
olwan wrote:
Is it possible to lend me your brain for 4 hours on the 30th of May?

Isnt that a wonderful thought!

But we wont be able to do that

Practice they say, is the key!
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Re: 8 years ago, George was half as old as Sarah. Sarah is now [#permalink]
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olwan wrote:
8 years ago, George was half as old as Sarah. Sarah is now 20 years older than George. How old will George be in 10 years?

In step one, the book assigned one Variable for both Sarah and George and wrote that
8 years ago
George G-8
Sarah G+12

I know how to solve this the long way assigning 2 variable, which is troublesome and I most of the time get it wrong. Could you explain why Sarah is G+12 ?

And could you tell me the easiest way to solve those kinds of problems

8 Years ago, George age was half as old as Sarah age => G-8=S-8/2 ------ <1>
Now, Sarah is 20 years older than George => S=G+20 ------ <2>

Substitute <2> in <1> and solve for George age (G)
G=28
after 10 years
G+10=38

Thanks
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Re: 8 years ago, George was half as old as Sarah. Sarah is now [#permalink]
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Re: 8 years ago, George was half as old as Sarah. Sarah is now [#permalink]
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