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How many passengers can be seated on a plane with r rows, if each row

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How many passengers can be seated on a plane with r rows, if each row  [#permalink]

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New post 01 Mar 2018, 23:05
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Question Stats:

80% (00:39) correct 20% (00:51) wrong based on 41 sessions

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How many passengers can be seated on a plane with r rows, if each row consists of d double seats and t triple seats?

(A) rdt

(B) rd + rt

(C) 2dr + 3tr

(D) 3dr + 2tr

(E) rd + t

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Re: How many passengers can be seated on a plane with r rows, if each row  [#permalink]

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New post 01 Mar 2018, 23:45
Bunuel wrote:
How many passengers can be seated on a plane with r rows, if each row consists of d double seats and t triple seats?

(A) rdt

(B) rd + rt

(C) 2dr + 3tr

(D) 3dr + 2tr

(E) rd + t


'd' double seats means number of passengers which can sit = d*2 = 2d
and 't' triple seats means number of passengers which can sit = t*3 = 3t
Thus in each row, number of passengers which can be seated = 2d + 3t

In 'r' rows total = r* (2d + 3t) = 2dr + 3tr

Hence C answer
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Re: How many passengers can be seated on a plane with r rows, if each row  [#permalink]

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New post 15 Mar 2018, 16:02
Since rows consist of double and triple seats only, in which can sit \(2d\) and \(3t\) passengers, total number of passengers in a row is equal to \(2d + 3t\)

Therefore, total number of passengers in the plane is - \(r(2d +3t) = 2dr + 3tr\)

Answer: C
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Re: How many passengers can be seated on a plane with r rows, if each row &nbs [#permalink] 15 Mar 2018, 16:02
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