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resilient: Legendary Member; Posts: 789; Joined: Sun May 06, 2007 1:25 amFollowed by: 6 members; Location: Southern California, USA; Thanked: 15 times

by resilient » Wed Feb 13, 2008 7:38 pm

for the ast n days, the average daily prodution at a company was 50 units. f today's production of 90 units rases the average to 55 units per day, what is the value of N?

a. 30
b.18
c.10
d.9
e. 7

IS there an easier way to do this?

qa is E

Appetite for 700 and I scraped my plate!

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Source: Beat The GMAT — Problem Solving | Wed Feb 13, 2008 7:38 pm

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Wed Feb 13, 2008 8:44 pm

Use the average formula.

We know that average = sum/# of terms

In this case, the average = 55
the # of terms = N + 1
Sum = 50(n) + 90

So:

55 = (50n + 90)/(n + 1)

55(n + 1) = 50n + 90

55n + 55 = 50n + 90

5n = 35

n = 7

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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resilient: Legendary Member; Posts: 789; Joined: Sun May 06, 2007 1:25 amFollowed by: 6 members; Location: Southern California, USA; Thanked: 15 times

translation perspective

by resilient » Sun Feb 17, 2008 12:42 am

OK I UNDERSTAND THE MATH AND NOW KNOW WHERE I WENT WRONG. I DIDNT TRANSLATE CORRECTLY.. DO YOU KNOW OF A PLACE TO GO TO IN ORDER TO GET BEEFED UP ON MATH TRANSLATIONS?

Appetite for 700 and I scraped my plate!

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Sun Feb 17, 2008 1:42 pm

Based on the other questions that you've posted, I really suggest taking a course (if one is available in your area) or hiring a tutor.

These boards are a great way to supplement a course or for people who are close to their goals to make it on their own, but if you need to make a LOT of progress then you need some extensive resources and access to live help.

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senthil: Master | Next Rank: 500 Posts; Posts: 188; Joined: Sun Dec 23, 2007 7:40 am; Location: INDIA; Thanked: 4 times

Quickest Approach

by senthil » Mon Feb 18, 2008 10:23 am

its given 90 units per day increases the avg by 55 (50+5).therfore it inadvertly means the 40 extra units produced on that particular day was splitted into 5 units for the rest of the days .hence 40/5 = 8 ( which includes the last day with produced 90 units ) Therefore excluding it ,it wud be 7 days....

Thanks
Senthil

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