try setting up a 2 by 2 matrix, it gets much easier.
1) with the info given, we can find out the number of unbroken in box 2
2) solving for z which is 32, we can populate the matrix and find out the required info.
both statements are equally sufficient.
lightbulbs
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Source: Beat The GMAT — Data Sufficiency |
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scoobydooby
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ghacker
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There is no need for a matrix to solve this question , its very basic logic
First statement is sufficient ( there is no problem with it)
Lets look at the second one
Before that what is given :
1.0 there are 55 bulbs
2.0 2 broken bulbs - First box
3.0 5 broken bulbs in the second
{ remember that the total (55) includes the broken ones and there distribution is given )
so from this we know that (2+good bulbs in A)+(5+good ones in B) =55
so B has three o extra bad bulbs
Then Statement II states that A has 12 more B , so we can find out how many good bulbs are there in B
Sufficient
So D
First statement is sufficient ( there is no problem with it)
Lets look at the second one
Before that what is given :
1.0 there are 55 bulbs
2.0 2 broken bulbs - First box
3.0 5 broken bulbs in the second
{ remember that the total (55) includes the broken ones and there distribution is given )
so from this we know that (2+good bulbs in A)+(5+good ones in B) =55
so B has three o extra bad bulbs
Then Statement II states that A has 12 more B , so we can find out how many good bulbs are there in B
Sufficient
So D
