GMAT Data Sufficiency Discussions

MBA GMAT
1341

By the way, thanks for the prompt reply, deepakraam !! Hope to hear from you soon on how to solve this problem for "Statement 1 alone is sufficient".

1342
Hello everyone,

How's it going? I am new to pagalguy.com and was wondering if you could help me out a little. I have attached a file (sorry for the inconvenience, but I needed the triangle from the question), whose solution I am unable to understand.

Can anyone help me out here??


the answer must be eqn 1 alone..i.e. option A

BCD and ADB be 2 diff triangles..

in triangle BCD
angBDC = angBCD = 2x
thus, angDBC = (180 - 2x) >> eqn(1)

in triangle ADB
angDAB = x
and owing to eqn eqn(1) above, andBDA = 180 - 2x
thus angABD = x

thus side AD = BD >> eqn(2)

per question, side DB = DC

thus we have AD = DB = BC = 6

hence answer is option A

hope that helps 😉
1343
Hello everyone,

How's it going? I am new to pagalguy.com and was wondering if you could help me out a little. I have attached a file (sorry for the inconvenience, but I needed the triangle from the question), whose solution I am unable to understand.

Can anyone help me out here??



IMO A. here my explanation

In the figure AD=BD since Angle A and Angle B are equal and BD=BC since angle D is equal to angle C.

Consider 1) AD=6 from this we get BC =6 hence suff.

Consider 2) this does not talk abt length and talks abt angles.So insuff.

Hence A Whats the OA?
1344
How many integers n are there such that
r ?
(1) s r = 5
(2) r and s are not integers.
1345
If P,Q,R,S are positive inters , and P/Q=R/S , Is R is divisible by 5?

i.p is divisible by 140
ii.Q= 7^x , where x is positive integer
1346
In the xy plane, at what two points does the graph of y= (x+a)(x+b) intersect the x axis?
(1) a+b=-1
(2) the graph intersects the x=axis at at (0,6)
1347
Is 1/r>1?
(1) pqr>1
(2) pqr^2>1
1348
In the rectangular coordinate system, are the points (a, b) and (c, d) equidistant from the origin?

(1) a/b = c/d

(2) Square root of (a^2) + Square root of (b^2) = Square root of (c^2) + square root of (d^2).
1349

@siddharthaduggirala
seems someone opened the DS book after a very looooooooooooooong time

1350
How many integers n are there such that

r ?
(1) s r = 5
(2) r and s are not integers.


I would have marked it as option C

(1) s r = 5
number types for s & r are not defined..

(2) r and s are not integers.
doesnt help at all

taking both together.. the problem gets resolved
take examples like below;
8.1 - 3.1 = 5.0
intergers in between are: 8,7,6,5,4 & 3 = count = 6

99.9 - 94.9 = 5
intergers in between are: 99,98,97,96,95 & 94 = count = 6

take fraction;
20/3 - 5/3 = 15/3 = 5
20/3 = 6.67
5/3 = 1.67
interger in between are: 6,5,4,3,2 & 1 = count = 6

so option C.. wat is the OA??
1351
In the xy plane, at what two points does the graph of y= (x+a)(x+b) intersect the x axis?
(1) a+b=-1
(2) the graph intersects the x=axis at at (0,6)

y= (x+a)(x+b)
y = x^2 + (a+b)x + ab

Eqn1:
a+b = -1 = slope of the line

line be; y = mx + C
m = -1
y = -x + C

Eqn2:
y intercept is @ 6

wat next.. I dunno.. wait for some guru..

I would have marked option E..not sure why or why not
1352
I would have marked it as option C

(1) s r = 5
number types for s & r are not defined..
(2) r and s are not integers.
doesnt help at all

taking both together.. the problem gets resolved
take examples like below;
8.1 - 3.1 = 5.0
intergers in between are: 8,7,6,5,4 & 3 = count = 6

99.9 - 94.9 = 5
intergers in between are: 99,98,97,96,95 & 94 = count = 6

take fraction;
20/3 - 5/3 = 15/3 = 5
20/3 = 6.67
5/3 = 1.67
interger in between are: 6,5,4,3,2 & 1 = count = 6

so option C.. wat is the OA??



The OA is C
1353
In the rectangular coordinate system, are the points (a, b) and (c, d) equidistant from the origin?


(1) a/b = c/d


(2) Square root of (a^2) + Square root of (b^2) = Square root of (c^2) + square root of (d^2).


I guess option B..!!..
1354
y= (x+a)(x+b)
y = x^2 + (a+b)x + ab

Eqn1:
a+b = -1 = slope of the line

line be; y = mx + C
m = -1
y = -x + C

Eqn2:
y intercept is @ 6

wat next.. I dunno.. wait for some guru..

I would have marked option E..not sure why or why not



The OA is C.

Here is the expl:

y=x^2+(a+b)x+ab.

from 1 we know x^2-x+ab. so 1) alone is insuff.

take 2) the graph intersects the x=axis at at (0,6)
so 6=ab so this alone is insuff.

now combining both we have

x^2-x+6=0 so from here we get our two points.

So C.
1355
the answer must be eqn 1 alone..i.e. option A

BCD and ADB be 2 diff triangles..

in triangle BCD
angBDC = angBCD = 2x
thus, angDBC = (180 - 2x) >> eqn(1)

in triangle ADB
angDAB = x
and owing to eqn eqn(1) above, andBDA = 180 - 2x
thus angABD = x

thus side AD = BD >> eqn(2)

per question, side DB = DC

thus we have AD = DB = BC = 6

hence answer is option A

hope that helps ;)

Hey guys,

Thanks so much for your help. I had worked out DA=DB, but I don't know how I missed the last point where if DA=DB and BD=BC, then AD=BC. I feel like an idiot now that I have seen the solution. But thank you all so much for your help.
1356
nuttyvarun Says
I guess option B..!!..


If option b is square root of (a^2 + b^2) = square root of (c^2 + d^2), then option b by itself is sufficient. But if the choice is given as in your post, then I think it should be option e.
1357

Is ans for the below DS q -both statements togther are nt suff?

If P,Q,R,S are positive inters , and P/Q=R/S , Is R is divisible by 5?

i.p is divisible by 140
ii.Q= 7^x , where x is positive integer

1358

Is ans the for the below DS - both statements are suff to ans the q


Is 1/r>1?
(1) pqr>1
(2) pqr^2>1

1359

Is ans for below DS- Statement 2 alone is suff and nt statemen 1?



In the rectangular coordinate system, are the points (a, b) and (c, d) equidistant from the origin?

(1) a/b = c/d

(2) Square root of (a^2) + Square root of (b^2) = Square root of (c^2) + square root of (d^2).

1360
Is 1/r>1?
(1) pqr>1
(2) pqr^2>1




stmt 1:

2*(3/2)* (4/3) >1

r=4/3 => 1/r
(9)*(4/3)*(1/4) >1

r = 1/4 => 1/r >1

not suff to ans.

stmt 2

(pqr)^2 >1

=> pqr >1

this again is stmt 1

so no suff.

ans .. E