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# The wait time in minutes, w, for a table at a certain restau

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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

The wait time in minutes, w, for a table at a certain restau [#permalink]  30 Jul 2018, 09:36
Expert's post
00:00

Question Stats:

100% (01:00) correct 0% (00:00) wrong based on 4 sessions
The wait time in minutes, w, for a table at a certain restaurant can be estimated by the formula $$w = d^2 + kn$$, where d is the number of diners in the party, k is a constant, and n is the number of parties ahead in line at the beginning of the wait. If a party of 4 has an estimated wait time of 40 minutes when 6 other parties are ahead of it, how many minutes would the estimated wait time be for a party of 6 if there are 3 parties ahead of it?

(A) 28
(B) 33
(C) 39
(D) 42
(E) 48
[Reveal] Spoiler: OA

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Sandy
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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

Re: The wait time in minutes, w, for a table at a certain restau [#permalink]  12 Aug 2018, 05:38
Expert's post
Explanation

Start by solving for the constant, k. A party of 4 (d = 4) has an estimated wait time of 40 minutes (w = 40) when 6 other parties are ahead of it (n = 6). Plug these values into the formula:

$$w = d^2 + kn$$
$$40 = 4^2 + k(6)$$
$$40 = 16 + 6k$$
$$24 = 6k$$
$$k = 4$$

Then solve for the wait time for a party of 6 (d = 6) if there are 3 parties ahead of it (n = 3), using the constant k = 4 determined above:
$$w = d^2 + kn$$
$$w = 6^2 + 4(3)$$
$$w = 36 + 12$$
$$w = 48$$ minutes
_________________

Sandy
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Re: The wait time in minutes, w, for a table at a certain restau   [#permalink] 12 Aug 2018, 05:38
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