OK, first post but (as all say) I have been reading for a

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OK, first post but (as all say) I have been reading for a [#permalink]

07 Jan 2007, 15:01

OK, first post but (as all say) I have been reading for a while and it has been a valuable resource. Well, also slightly intimidating, as everyone seems to have committed a lot more prep time to the GMAT than I could manage.

Anyway, I have the test tomorrow, and on the practice test only got one question that I cannot resolve. It was the first one, I got it wrong, and I can't work out the underlying process to get the answer (all the others made fair sense).

Anyway

5^21 * 4^11 = 2 * 10^n

Find n. The answers available don't really matter, I would just really appreciate a full solution so I can see what rules I am missing.

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07 Jan 2007, 15:13

4^11 = (2^2)^11 = 2^22 = 2 * 2^21

5^21 * 2 * 2^21 = 2 * (5 * 2)^21 = 2 * 10^21

n = 21

peanuts

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07 Jan 2007, 15:34

Thank you very much. I remember being poor at deconstructing exponentials about 12 years ago as well!

Makes good sense now - I will go back to swotting on my exponential rules.

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07 Jan 2007, 17:51

braindancer wrote:

Never argue with an idiot. They drag you down to their level, then beat you with experience.

Very touchy. I like it.

But should not it be like this "Never argue with idiots. They drag you down to their level, then beat you with their experience."?

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08 Jan 2007, 02:53

Well yes, I think you're right, but it's a quote so I left it that way

Don't overGMAT on everything - sometimes sentence correction is not really necessary :lol:

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10 Jan 2007, 09:10

5^21*2^22=2*2^n*5^n
5^21*2^22=2^(n+1)5^n
n+1=22 n=21

[#permalink] 10 Jan 2007, 09:10

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OK, first post but (as all say) I have been reading for a

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OK, first post but (as all say) I have been reading for a

OK, first post but (as all say) I have been reading for a

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