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divya23: Master | Next Rank: 500 Posts; Posts: 113; Joined: Mon Apr 26, 2010 8:58 amFollowed by: 14 members; Thanked: 2 times

by divya23 » Sun Jun 19, 2011 1:48 am

i am posting in very concise words

mean sales frm jan to oct = 120000 each month
nov sales is 3 times avg of other 10 months
dec sales is 5 times of other 10 months
find monthly sales avergae of all months

ans = 180000

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Source: Beat The GMAT — Problem Solving | Sun Jun 19, 2011 1:48 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Sun Jun 19, 2011 2:03 am

November sale = 3*120,000 = 360,000
December sale = 5*120,000 = 600,000

Total sale of 12 months = 10*120,000 + 360,000 + 600,000 = 2160,000
Average monthly sale of 12 months = 2160,000/12 = 180,000

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divya23: Master | Next Rank: 500 Posts; Posts: 113; Joined: Mon Apr 26, 2010 8:58 amFollowed by: 14 members; Thanked: 2 times

by divya23 » Sun Jun 19, 2011 3:38 am

please delete this post thanks

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amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Sun Jun 19, 2011 4:04 am

total for 10 months = 120k * 10 = 1200k

for nov = 3*1200k

for dec = 1200k * 10

thus total/12 = 180,000

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Sudarshan.K: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Wed May 25, 2011 2:24 am

by Sudarshan.K » Mon Jun 27, 2011 5:38 am

divya23 wrote: nov sales is 3 times avg of other 10 months
dec sales is 5 times of other 10 months
find monthly sales avergae of all months

ans = 180000

@Anurag,
although I agree with your explanation, don't you think there seems to be some catch in the highlighted statement?
nov is 11th month. so comparing sales of nov with average sales of other 10 months means jan-oct
but dec is 12th month. here the comparison of dec sales with average sales of 'other 10 months' could mean any of the 10 months from jan-nov. we can't restrict it to first sequential 10 months unless unambiguously specified. I hope I made myself clear to be understood.

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