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a + b > - c

Expert replies
by maihuna » Fri Oct 30, 2009 9:54 am
If a + b > - c, is a > 2?

(1) a + b + c > 8
(2) - a + b + c < - 4


[spoiler]This is a yes/no question so you should plug in. For statement 1, if you plug in a = 3, b = 5, c = 4, then you get an answer of "yes," but if a = 1, b = 6, c = 2, then you get an answer of "no," so you should write down BCE. Now try plugging in for statement 2. Remember, when you're plugging into a yes/no question that begins "If . . .", you have to find numbers that satisfy both the statement and the "If" part of the question. So if a = 3 and b = 2, then c could be - 4 and you get an answer of "yes." Go ahead and try to get an answer of no. If a = 2 and b = 2, then, according to the original "If" constraint, c has to be greater than - 4. But - 2 + 2 + - 3.9 = - 3.9, which is greater than - 4. No matter what number for a < 2 you try to plug in, it won't satisfy both the statement and the constraint. Therefore, the answer has to be B.
[/spoiler]

[spoiler]Any better explanation possible, i thought of this one:
Given a+b+c>0 1 says the same thing, 2 says :
a>-b-c, using 2, -a < -b-c-4 or a>b+c+4
adding the two: 2a>4 or a>2
[/spoiler]
Charged up again to beat the beast :)
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Source: — Data Sufficiency |

by alexchow » Sun Nov 01, 2009 5:41 am
Looks like b.

(i) means a+b-8>-c but composition of a+b is not known.

(ii) subtract the inequalities

a+b > -c
-
-a+b > -4 -c
=
a-(-a)+b-b > -c-(-4-c)

--> 2a >4 ---> a>2

Sufficient.
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by satish.nagdev » Sun Nov 01, 2009 10:31 am
IMO C,
we need both statements to determine a's value.
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by tarun.kirla » Mon Nov 02, 2009 9:08 am
satish.nagdev wrote:IMO C,
we need both statements to determine a's value.
can u please explain
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by satish.nagdev » Mon Nov 02, 2009 7:33 pm
I approached in this way

given
1) a + b + c > 8 ==> no info about a
2) - a + b + c < - 4 ==> no info about a

together

(1) a + b + c > 8
(2) - a + b + c < - 4 ==> a -b -c >4
a + b + c + a - b - c > 8 + 4
2a > 12
a > 6
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by mehravikas » Mon Nov 02, 2009 8:04 pm
IMO - C

Solution - same as above
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by 2010gmat » Tue Nov 03, 2009 1:50 am
maihuna...i agree with you..ans should be B
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by crackgmat007 » Tue Nov 03, 2009 1:32 pm
1. Not sufficient - as it says a + b + c > 8

2. Sufficient - add inequalities given in question

a + b + c > 0

a - b - c > 4 ( multiply stmt 2 with with -1)

We get a > 2
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by Stuart@KaplanGMAT » Tue Nov 03, 2009 2:29 pm
satish.nagdev wrote:I approached in this way

given
1) a + b + c > 8 ==> no info about a
2) - a + b + c < - 4 ==> no info about a

together

(1) a + b + c > 8
(2) - a + b + c < - 4 ==> a -b -c >4
a + b + c + a - b - c > 8 + 4
2a > 12
a > 6
The reason why you incorrectly arrive at "C" is because you're ignoring the original inequality:

a + b + c > 0

You can do the exact same thing with statement (2) alone and the original inequality as you did when combining the two statements. Since we have that original inequality, we don't need statement (1) at all.

Remember step 2 of the Kaplan Method for DS:

look at each statement individually, in conjunction with the information in the question stem.

Since (2) + the orginal information is sufficient, (B) is the correct answer to the question.
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by satish.nagdev » Tue Nov 03, 2009 5:51 pm
Thanks Stuart for correcting
when will I quit these silly mistakes :(( :(
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