Div A and Div B

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sandy217: Master | Next Rank: 500 Posts; Posts: 165; Joined: Wed Aug 04, 2010 9:44 pm; Thanked: 8 times

by sandy217 » Tue Aug 16, 2011 5:03 am

2. IN 1995, Division A (DA) of Company X had 4,850 customers. If there were 86 service errors in DA that year, what was the service error rate, in number of service error per 100 customers, for Division B (DB) of company X in 1995?

i. In 1995 the overall service-error rate for DA and DB combined was 1.5 service-error per 100 customers?
ii. In 1995, DB had 9,350, none of whom were customers of DA.

OA C One quick question.What if the some customers of A overlaps with B customers in that 4850?
In 2, it is explicitly mentioned that among 9,350 no overlap exists.But it fails to present the same with A. So i chose E and i thought i nailed it

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Source: Beat The GMAT — Data Sufficiency | Tue Aug 16, 2011 5:03 am

GmatKiss: Legendary Member; Posts: 2789; Joined: Tue Jul 26, 2011 12:19 amFollowed by: 43 members; Location: Chennai, India; Thanked: 206 times; GMAT Score:640

by GmatKiss » Tue Aug 16, 2011 6:57 am

In 1995, DB had 9,350, none of whom were customers of DA
DA is not Company X. So it means, DB had 9350 employees of the Company X

Now 1+2, C is sufficient

Please correct me if am wrong!

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sandy217: Master | Next Rank: 500 Posts; Posts: 165; Joined: Wed Aug 04, 2010 9:44 pm; Thanked: 8 times

by sandy217 » Tue Aug 16, 2011 7:02 am

GmatKiss wrote:In 1995, DB had 9,350, none of whom were customers of DA
DA is not Company X. So it means, DB had 9350 employees of the Company X

Now 1+2, C is sufficient

Please correct me if am wrong!

I think i lost you. Are you saying DA is not part of X??
But argument clearly says "Division A of Company X".

My question is how can rule out the overlap of Div A customers(4,850 ) with Div B customers. Reverse is ruled out explicitly in ii.

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Tani: Legendary Member; Posts: 1255; Joined: Fri Nov 07, 2008 2:08 pmFollowed by: 90 members; Location: St. Louis; Thanked: 312 times

by Tani » Tue Aug 16, 2011 8:24 am

When you combine answers, the information applies to the total. If you know that B shares no customers with A, then you also know A shares no customers with B. You can't use that information when working with A alone, which is why you need to combine the statements.

Tani Wolff

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