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# GMAT prep

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Senior Manager
Joined: 12 Mar 2009
Posts: 301

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02 Jun 2009, 23:26
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Senior Manager
Joined: 15 Jan 2008
Posts: 260

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02 Jun 2009, 23:45
1, statement is sufficient i.e (600*20 + 300*10 )/ 30 gives the average balance.
2, statement is also sufficient, heres how..

for 25 days the average balance is 540, so tha total till 25 days is 25*540.

as 540 is less than 600, some credit must happen within 25 days and we need to find which day is that.
let the credit happen after x days.

So, the total sum for 25 days will be 600x + 300(25-x) = 25*540..
X can be solved out from the above equation... hence the total average can also be found out..

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: GMAT prep &nbs [#permalink] 02 Jun 2009, 23:45
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