GMAT Data Sufficiency Discussions

MBA GMAT
895
the answer to this one should be 2 i.e the quantity in Column B is greater;

Quantity A: = .82 * .82* 6(0.82)6(Quantity B) ( as square of .82 will be less than .82 i.e around .6...)

answer is A
for any no betwwen 0 and 1, lower the index, higher the value.
eg (o.2)^2 = 0.04 and (o.2)^3 = 0.008
Col A = 0.82^5
Col B = 0.82^6
clearly col A > Col B

thanks
896
Can sumbdy plz help me out with this
Quantity A: (0.82)2(0.82)3

Quantity B:(0.82)6
  1. if the quantity in Column A is greater;
  2. if the quantity in Column B is greater;
  3. if the two quantities are equal;
  4. if the relationship cannot be determined from the information given


Column A is greater.
897

11. Is n an integer greater than 4?
(1) 3n is a positive integer.
(2) is a positive integer.

898
11. Is n an integer greater than 4?
(1) 3n is a positive integer.
(2) is a positive integer.



pls repost the Question !
899
At least 100 students at a certain high school study Japanese. If 4% of the students who study French also study Japanese, do more students at the school study French than Japanese ?

1) 16 students at the school study both French and Japanese

2) 10% of the students at the school who study Japanese also study French.
900
At least 100 students at a certain high school study Japanese. If 4% of the students who study French also study Japanese, do more students at the school study French than Japanese ?
1) 16 students at the school study both French and Japanese
2) 10% of the students at the school who study Japanese also study French.


Answer to this one should be b i.e it can be answered by second statement alone but not by first alone
901
answer is A
for any no betwwen 0 and 1, lower the index, higher the value.
eg (o.2)^2 = 0.04 and (o.2)^3 = 0.008
Col A = 0.82^5
Col B = 0.82^6
clearly col A > Col B

thanks


Hi srikanth267,
yes you are right, actually i took 2 n 3 in statement as multiplication factor instead of power
902
Inder.14 Says
Answer to this one should be b i.e it can be answered by second statement alone but not by first alone


OA IS B) .... Can u pls explain....
903
At least 100 students at a certain high school study Japanese. If 4% of the students who study French also study Japanese, do more students at the school study French than Japanese ?
1) 16 students at the school study both French and Japanese
2) 10% of the students at the school who study Japanese also study French.


Hi..
The answer is B saying Fact statement 1 is not sufficient and Fact sufficient is sufficient....
FS1-16 students study french and japanese means this corresponds to 4% french students who study japanese. Therefore, total french students is 400 which is more than people who study japanese(in this case lets assume japanese students to be 100)
But it says japanese students are atleast 100, which means it can be 500 also thus I cant say if do more students at the school study French than Japanese.

FS2- 10% of japanese students study french as well. Let us assume japanese students to be 100 therefore, 10% of 100=10 and this 10 corresponds to 4% french students which is equal to 250.
Whatever value you take for japanese students definetly it will be less that the total french students. So, FS2 is sufficient.

Well tried my best to explain by typin :new_rainbow:
904

1) Of the 60 animals on a certain farm, 2/3rd are either pigs or cows.How many of the animals are cows?

a) the farm has more than twice as many cows as it has pigs
b) the farm has more than 12 pigs

2) Of the 200 members of a certain association , each member who speaks german also speaks english, and 70 of the members speak only spanish.If no member speaks all the three languages , how many of the members speak two of the three languages ?

a) 60 of the members speak only english
b) 20 of the members do not speak any of the three languages

905
1) of the 60 animals on a certain farm, 2/3rd are either pigs or cows.how many of the animals are cows?

A) the farm has more than twice as many cows as it has pigs
b) the farm has more than 12 pigs

2) of the 200 members of a certain association , each member who speaks german also speaks english, and 70 of the members speak only spanish.if no member speaks all the three languages , how many of the members speak two of the three languages ?

A) 60 of the members speak only english
b) 20 of the members do not speak any of the three languages


1 - a
2 - e

wats the OA?
906
1) Of the 60 animals on a certain farm, 2/3rd are either pigs or cows.How many of the animals are cows?

a) the farm has more than twice as many cows as it has pigs
b) the farm has more than 12 pigs

2) Of the 200 members of a certain association , each member who speaks german also speaks english, and 70 of the members speak only spanish.If no member speaks all the three languages , how many of the members speak two of the three languages ?

a) 60 of the members speak only english
b) 20 of the members do not speak any of the three languages

the answers should be
1) D (It can be answered by both the statements together)
2) D (It can be answered by both the statements together)
what are OAs?
907
the answers should be
1) D (It can be answered by both the statements together)
2) D (It can be answered by both the statements together)
what are OAs?



Hi Inder,

I am a bit confused with ur answers because as per GMAT DS -option D means both statements alone are sufficient and in the bracket you have written - it can be answered by both statements together.

Anyways OA s are c) and c)

Can anyone explain ...
908

Hi,
Let me explain.Let E ,S and G be the three groups.Now G is completely contained within E.And E and S have no intersection.So,in short we have to find the small innner circle within E(the ones who speak german and english).
Hence using both,we get the following
Answer= 200-60-70-20
Hope u understand
(This question prompted me to write my first post :smile:)

909
Hi Inder,

I am a bit confused with ur answers because as per GMAT DS -option D means both statements alone are sufficient and in the bracket you have written - it can be answered by both statements together.

Anyways OA s are c) and c)

Can anyone explain ...


Hi italian7745,
in that case i guess i remembered the option wrong .......
as per my understanding
A) can be answered by first only
B) can be answered by second only
C) can be answered by either alone
D) can be answered by both together
e) can not be answered by using both as well

I am sorry for confusing you..........
any way the answer for both will be
we need both the statements to answer

Now the expalnation for first one
1) Of the 60 animals on a certain farm, 2/3rd are either pigs or cows.How many of the animals are cows?

a) the farm has more than twice as many cows as it has pigs
b) the farm has more than 12 pigs

As per problem statement
C + P = 2/3*60=40
now lets take first staement
it says
C>2P so we can not conclude based on that .

Now as per second statement
p>12...... this also is not sufficient to answer
Now lets combine two statement
first says C>2P and second says P>12
now lets take P =13
=> C >2P i.e C>26
Now we are given C + P =40
only possibility is P=13 and C=27
Hence, we need both the statement
Hope m clear............
910

Hi Puys,

Take a look at this stuff:

In the seven days of the last week, store S sold a total 90 copies of a certain book and it sold different number of copies on any two of the days. The greatest number of copies were sold on Saturday and the second greatest number of copies on Friday. Is the number of copies sold on Friday greater than 11?

1. 8 copies were sold on Thursday
2. 38 copies were sold on Saturday

Thanks.

911
Hi Puys,

Take a look at this stuff:

In the seven days of the last week, store S sold a total 90 copies of a certain book and it sold different number of copies on any two of the days. The greatest number of copies were sold on Saturday and the second greatest number of copies on Friday. Is the number of copies sold on Friday greater than 11?

1. 8 copies were sold on Thursday
2. 38 copies were sold on Saturday

Thanks.

I think the Answer is : E

Explanation :
using first statement we can not conclude , hence option 1 is out
using second statement :
as 38 copies are sold on saturday , 52 copies are left for remaining days .
to find the minimum number of sales on friday , we distribute 52 equally among other days . 52/6 equal to 8 and 4 is the remainder , hence 8 on each of the day ( except saturday ) Remaining 4 books can be distributed among other days satisfying condition friday need to second highest sales day , we have two cases :
case 1 :all those remaining 4 on Friday ( hence Finally 8+4 = 12 on Friday )
case 2 : 1 on Monday , 1 on Tuesday , remaining 2 on Friday ( hence Finally Friday : 10 , Monday 9 , Tuesday : 9 , other days : 8 .
In the First Case : Friday is greater than 11 , In second Case : Friday is less than 11 .
Hence both the statements are not enough to find the solution .
Hope my explanation is clear

Cheers
Aditya
912

Hi Aditya,
I think the answer will be D.In ur explanation,you are saying that we distribute equally among the other days.But question says no two days have similar sales.
Please tell the OA.

913
Hi Aditya,
I think the answer will be D.In ur explanation,you are saying that we distribute equally among the other days.But question says no two days have similar sales.
Please tell the OA.

I am sorry ! I missed out that important point , actually i was in office and my Dirty Manager would be peeping into my monitor , hence i could not read with complete concentration , i shall edit my post now , Thanks suruchee for pointing out my mistake
cheers
Aditya
914
I think the Answer is : E

Explanation :
using first statement we can not conclude , hence option 1 is out
using second statement :
as 38 copies are sold on saturday , 52 copies are left for remaining days .
to find the minimum number of sales on friday , we distribute 52 equally among other days . 52/6 equal to 8 and 4 is the remainder , hence 8 on each of the day ( except saturday ) Remaining 4 books can be distributed among other days satisfying condition friday need to second highest sales day , we have two cases :
case 1 :all those remaining 4 on Friday ( hence Finally 8+4 = 12 on Friday )
case 2 : 1 on Monday , 1 on Tuesday , remaining 2 on Friday ( hence Finally Friday : 10 , Monday 9 , Tuesday : 9 , other days : 8 .
In the First Case : Friday is greater than 11 , In second Case : Friday is less than 11 .
Hence both the statements are not enough to find the solution .
Hope my explanation is clear

Cheers
Aditya

I overlooked one condition in my previous post :
Here is the correct answer (I think this is correct atleast )
Explanation :
using first statement we can not conclude , hence option 1 is out
using second statement :
as 38 copies are sold on saturday , 52 copies are left for remaining days .
given condition is : Friday need to have second highest no of copies sold and each day should have differnent number of copies sold .
if friday have 11 copies , remaining 5 days can at max have 10 , 9 , 8, 7, 6 copies in each .
so Totally for remaining 6 days ( except saturday ) it counts to 51 copies ( 11+10+9+8+7+6) , but we need to have 52 copies , hence Friday has to have more than 11 copies
In conclusion , second statement alone is sufficient to decide that more than 11 copies are required to be sold on Friday .

Cheers