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divyam3433647
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Data Sufficiency Butler: September 2024
September 27DS 1DS 2
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Matthyrou
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answers for ds are both c, are they?
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agnee
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Yes

1/D+1/E=1/t ,
Q: is E/2<3 ?

1) t<3 I.e 1/t>1/3 not suff alone
2) D>360min=6hr
I.e 1/D<1/6 I.e -1/D>-1/6
not suff alone

Combining 1)+ 2) :
1/E=1/t-1/D >1/3-1/6=1/6
Ie E<6
Ie E/2< 3
Sufficient
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Hi, a silly question may be but please answer, if I practice all the GMAT Prep(focus) questions from the question bank here, am I actually solving all the questions from the official mocks too?

Apologies, i think i posted in the wrong chat group
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Yes, hence this is not a good idea else you will have not have sufficient material to practice
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In a class of 40 students, the average score on a math test was 58. If 10 students scored above 70, and the remaining students scored below 50, what is the average score of the 10 students who scored above 70?

A) 82
B) 85
C) 88
D) 90
E) 92
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If you take avg score of 30 students is x and x<50 ,
Then total score of 10 top scorers=58*40-30x=2320-30x>2320-30*50=820
I.e average of top 10 students >82
Now taking x=49,
Average of top 10 students=85

Can u pls think of a better way?
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10 students scored above 70
And, 30 scored below 50

30 could have a max score of 49
Hence, the difference from avg score of 58 is 9 marks (i.e 58-49)
The total shortfall of the score of 30 students to make an average of 58 marks will be 270 marks (9 marks each of 30 students)

This shortfall of 270 will be filled by 10 students who scored above 70
So, avg score of students above 70 will be
= 58 + (270/10)
= 58 + 27
= 85
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This question is not worded properly.
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agnee
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DevalGandhi
10 students scored above 70
And, 30 scored below 50

30 could have a max score of 49
Hence, the difference from avg score of 58 is 9 marks (i.e 58-49)
The total shortfall of the score of 30 students to make an average of 58 marks will be 270 marks (9 marks each of 30 students)

This shortfall of 270 will be filled by 10 students who scored above 70
So, avg score of students above 70 will be
= 58 + (270/10)
= 58 + 27
= 85
This seems okayish but I am just thinking why should we try maximising the average of 30 people and then minimising for 10 people and get the answer? Any strong intuition behind doing that?
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Subham9141
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Sorry 85 my mistake did the wrong subtraction
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Rosyy2024
In a class of 40 students, the average score on a math test was 58. If 10 students scored above 70, and the remaining students scored below 50, what is the average score of the 10 students who scored above 70?

A) 82
B) 85
C) 88
D) 90
E) 92
More importantly the average can be 46 or 48 also.. then what?
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agnee
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It can not definitely say what the average can be .. so wrong wording!
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jeffn
option D - 62 as it is 2*31
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agnee
It can not definitely say what the average can be .. so wrong wording!
85, 88, 91, 94...keep on adding 3 till 232...there are 50 possible answers to the question....The question should say "which of these is correct

correct"? Or something like the smallest possible.....
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