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A man buys some juice boxes. The boxes are from two

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A man buys some juice boxes. The boxes are from two [#permalink] New post 11 Jun 2009, 17:12
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A man buys some juice boxes. The boxes are from two different brands. How many boxes of brand A did the man buy if he bought $5.29 worth of boxes?
(1) The price of brand A box is $0.81 and the price of brand B box is $0.31
(2) The total amount of boxes is 9

Please explain
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Re: juice boxes [#permalink] New post 11 Jun 2009, 17:48
Answer is A

(1)
There are 5 Brand A boxes and 4 brand B boxes. This is the only condition that satisfies the total to be $5.29.


(2)
Doesn't give much info about brand A boxes. Thus, INSUFFICIENT.


I haven't figured out a way to solve such questions other than to work out keep plugging in numbers.

The way I did it is observe the last digits of the numbers, which are 1, 1 and 9.

Thus, the total number of boxes should be a multiple of 9. another easy way is to take note of statement B's info, although we don't use it directly while pluggin-in.

if anybody knows easier methods, please share.
Re: juice boxes   [#permalink] 11 Jun 2009, 17:48
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