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# What was the average money with the class of 50 students whose roll nu

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Manager
Status: The journey is always more beautiful than the destination
Affiliations: Computer Science
Joined: 24 Apr 2017
Posts: 50
Location: India
Concentration: Statistics, Strategy
GMAT 1: 570 Q40 V28
GPA: 3.14
What was the average money with the class of 50 students whose roll nu  [#permalink]

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07 Apr 2018, 02:27
1
00:00

Difficulty:

35% (medium)

Question Stats:

73% (01:24) correct 27% (01:47) wrong based on 37 sessions

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What was the average money with the class of 50 students whose roll numbers are from 1 to 50?

(1) The average money with the first 25 students of the class is \$25 more than the average money with the last 25 students.
(2) The average money with the first 25 students is twice the average money with the last 25 students.

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Joined: 02 Aug 2009
Posts: 7958
Re: What was the average money with the class of 50 students whose roll nu  [#permalink]

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07 Apr 2018, 20:48
What was the average money with the class of 50 students whose roll numbers are from 1 to 50?

(1) The average money with the first 25 students of the class is \$25 more than the average money with the last 25 students.
Let the AVERAGE with last 25 be x, so Average of first 25 is x+25..
Overall average=(x+x+25)/2
But x can be anything..
Insufficient

(2) The average money with the first 25 students is twice the average money with the last 25 students
Let the AVERAGE with last 25 be x, so Average of first 25 is 2x..
Overall average=(x+2x)/2=3x/2
But x can be anything..
Insufficient

Combined...
3x/2=(2x+25)/2........6x=4x+50....x=25

Overall average=75/2

Suff

C
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Re: What was the average money with the class of 50 students whose roll nu   [#permalink] 07 Apr 2018, 20:48
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