GMAT Data Sufficiency Discussions

hey puys can anybody give the answer for this data sufficiency question

A)1 alone is sufficient to answer the questions
B)2 alone is sufficient to answer the questions
C) both 1 and 2 together are required to answer the question but neither of the two is sufficient to answer the question
D)either 1 or 2 alone is sufficient to answer the questions
E)neither 1 nor 2 is necessary to answer the question

given below is an equation where the letters represent digits

PQ * RQ = XXX. find the sum of P+Q+R+X

1) X=9
2) the digits are unique


The answer is D.

X = 9 :

PQ * RQ = 999 = 3 * 3 * 3 * 37 = 27*37 Hence
Q = 7 and P+R = 5
P+Q+R+X = 5+7+9

the digits are unique :
possible values of XXX are
111/222/..../999 = 111 * (1/2/3/...9) = 37*3*(1/2/..../9)
= 37*(3/6....12/15/18/21/24/27)
But as given each of PQ and RQ end with Q and there is only one number which ends with 7 in our possible choices (that number is 27)
so again Q = 7 and P+R = 5
P+Q+R+X = 5+7+9

Answer is D. Each statement alone is sufficient.
hey puys can anybody give the answer for this data sufficiency question

A)1 alone is sufficient to answer the questions
B)2 alone is sufficient to answer the questions
C) both 1 and 2 together are required to answer the question but neither of the two is sufficient to answer the question
D)either 1 or 2 alone is sufficient to answer the questions
E)neither 1 nor 2 is necessary to answer the question

given below is an equation where the letters represent digits

PQ * RQ = XXX. find the sum of P+Q+R+X

1) X=9
2) the digits are unique


using 1)
X=9
999=37*27... so it is alone sufficient
using 2)
XXX can have a min value of 111 and max of 999... so it will always be a of the form 111n i.e. 37*3*n... so either PQ will be 37 or 74
as the digits are unique only 37*27 is a valid combination..so this statement also is sufficient.
SO answer might be D

Is x + y > 0 ?
(I) x - y > 1
(II) x/y + 1 > 0

Find the fourth consecutive even number:
(I) The sum of the last two numbers is 30
(II) The sum of the first two numbers is 22

Find the fourth consecutive even number:
(I) The sum of the last two numbers is 30
(II) The sum of the first two numbers is 22



My take is C.
Both the statements are necessary.
My take is C.
Both the statements are necessary.



I Think it should be D
Is x + y > 0 ?
(I) x - y > 1
(II) x/y + 1 > 0


Either 1 or 2 alone is sufficient to answer the question....
Find the fourth consecutive even number:
(I) The sum of the last two numbers is 30
(II) The sum of the first two numbers is 22


Either 1 or 2 alone is sufficient to answer the question....

Is x + y > 0 ?
(I) x - y > 1
(II) x/y + 1 > 0


Ans 2 alone

can the Positive integer P be expressed as the product of 2 integers , Each of which is greater than 1???

1>31

2> P is ODD

Is x + y > 0 ?
(I) x - y > 1
(II) x/y + 1 > 0


(I) x - y > 1
Means (x+y)(x-y)>0
But it can happen that both (x+y) and (x-y) are less than zero,
And still two negative terms multipled will be greater than zero.
So (x+y) can be 0
In this case (x+y)>zero.
Hence Statement I, insufficient to explain.

(II) x/y+1>0
(x+y)/y>0
for x>y>0 its true. in this case x+y>0
But its also true for 0>x>y, and in this case x+y
Hence Statement II, insufficient to explain.
Combining I and II together,also leads to two different scenarios, x+y > 0 and x+y
can the Positive integer P be expressed as the product of 2 integers , Each of which is greater than 1???
1>31

2> P is ODD



1.31

In this case, P can be equal to = 32,33,34,35,36
None of them is a prime number, so yes Positive integer P be expressed as the product of 2 integers, Each of which is greater than 1.

Statement I sufficient.
2. P is Odd
Well except 2, all prime numbers are odd, so P can be something like 5,7,17. In that case P cannot be expressed as the product of 2 integers

Statement II, insufficient.

Combining 2 statement
P can be equal to =33,35
In both case can be expressed as the product of 2 integers.
So Together also sufficient.

Is x + y > 0 ?
(I) x - y > 1
(II) x/y + 1 > 0


In both the cases both x and y can be positive or negative so even by combining both we cannot answer the question. . .
Find the fourth consecutive even number:
(I) The sum of the last two numbers is 30
(II) The sum of the first two numbers is 22


Either 1 or 2 alone is sufficient to find the answer. . .

2 also is insufficient when y is -ve.
So none is the answer

The sequence a1, a2,a3..aN..Of n integers is such that aK=K if K is Odd and aK=-Ak-1 if Ken, Is the sum of terms in the sequence positive?
A> N is ODD
B> an is positive

1, 2 and combining 1 and 2 we cannot come to any conclusion

The sequence a1, a2,a3..aN..Of n integers is such that aK=K if K is Odd and aK=-Ak-1 if Ken, Is the sum of terms in the sequence positive?
A> N is ODD
B> an is positive


Cannot be answered even by combining 1 and 2. . .
The sequence a1, a2,a3..aN..Of n integers is such that aK=K if K is Odd and aK=-Ak-1 if Ken, Is the sum of terms in the sequence positive?
A> N is ODD
B> an is positive



Option B is a restatement of Option A. An can be positive only if N is odd. Since A isn't sufficient and B isn't sufficient hence E.

Yesterday Nan parked her car at a certain parking garage that charges more for the first hour than for each additional hour. If Nans total parking charge at the garage yesterday was $3.75, for how many hours of parking was she charged?

(1) Parking charges at the garage are $0.75 for the first hour and $0.50 for each additional hour
or fraction of an hour.
(2) If the charge for the first hour had been $1.00, Nans total parking charge would have been
$4.00.