Sequences and averages

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Tue Mar 24, 2009 7:29 am

Answer is C

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REAL THING 1 (AUG 2007): 680 (Q43, V40)
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Source: Beat The GMAT — Data Sufficiency | Tue Mar 24, 2009 7:29 am

Sher1: Master | Next Rank: 500 Posts; Posts: 116; Joined: Fri Feb 20, 2009 9:26 am; Location: New Jersey; Thanked: 7 times; GMAT Score:660

by Sher1 » Tue Mar 24, 2009 7:44 am

St 1 gives us only the sum of the term. Nothing more we can do with it
St 2 give us only average

Together avg=sum/number

we have two of these and need to find the number of term which we can as 3124 / 4 = 781

C

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Tue Mar 24, 2009 8:59 am

This was so damn easy!
It was the second to last question of the test, so I bombed it probably because I Was tired.... I feel dumb now!

Beat The GMAT - 1st priority
Enter a top MBA program - 2nd priority
Loving my wife: MOST IMPORTANT OF ALL!

REAL THING 1 (AUG 2007): 680 (Q43, V40)
REAL THING 2 (APR 2009): 720 (Q47, V41)

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sanjay_dce: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Tue Jan 27, 2009 10:24 am

by sanjay_dce » Tue Mar 24, 2009 9:19 am

Sher1 wrote:St 1 gives us only the sum of the term. Nothing more we can do with it
St 2 give us only average

Together avg=sum/number

we have two of these and need to find the number of term which we can as 3124 / 4 = 781

C

from 1st stmt we know the sum of of numbers,
from 2ns stmt we know the avg

using both we know the value of n hence C

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rs2010: Master | Next Rank: 500 Posts; Posts: 232; Joined: Fri Jul 04, 2008 4:14 pmFollowed by: 1 member; Thanked: 14 times; GMAT Score:760

by rs2010 » Tue Mar 24, 2009 1:03 pm

mjjking wrote:This was so damn easy!
It was the second to last question of the test, so I bombed it probably because I Was tired.... I feel dumb now!

I envy you Mjking you have awesome scores in verbal

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Tue Mar 24, 2009 1:14 pm

And I envy all you engineers and mathematicians who easily get 48+ in Q without trying too hard... I would be pleased with a 47, but a 45-46 is ok too!

Beat The GMAT - 1st priority
Enter a top MBA program - 2nd priority
Loving my wife: MOST IMPORTANT OF ALL!

REAL THING 1 (AUG 2007): 680 (Q43, V40)
REAL THING 2 (APR 2009): 720 (Q47, V41)

Like this post

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