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
OA is c
What is wrong with option C and D here? I am confused.
How many passengers can be seated on a plane with r rows, if
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Hi All,
We're told that a plane contains R rows, each of which consists of D double seats and T triple seats. We're asked for the number of seats on the plane. This question can be solved by TESTing VALUES.
IF....
R=2, D=3 and T=4, then there are 2 rows with 3(2) + 4(3) = 6+12 = 18 seats in each row.
With 2 rows, that is 2(18) = 36 total seats
There's only one answer that matches...
Final Answer: C
GMAT assassins aren't born, they're made,
Rich
We're told that a plane contains R rows, each of which consists of D double seats and T triple seats. We're asked for the number of seats on the plane. This question can be solved by TESTing VALUES.
IF....
R=2, D=3 and T=4, then there are 2 rows with 3(2) + 4(3) = 6+12 = 18 seats in each row.
With 2 rows, that is 2(18) = 36 total seats
There's only one answer that matches...
Final Answer: C
GMAT assassins aren't born, they're made,
Rich
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d double seats will seat 2d passengersBTGmoderatorRO 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
OA is c
What is wrong with option C and D here? I am confused.
t triple seats will seat 3t passengers
So, the total number of seats in ONE ROW = 2d + 3t
The plane has a total of r rows.
So, the TOTAL number of seats = r(2d + 3t)
Check the answer choices....not there (at least not in the above form)
Expand to get: 2dr + 3tr
Answer: C
Cheers,
Brent
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If 2 people can sit in a double seat, then we have 2d
if 3 people can sit in a triple seat, then we have 3t
for 1 (one) row, it would be 2d + 3t
Note that double seat =d and tripple seat=3d
Therefore, for r rowas, it would be r(2d+3t) = 2dr+3tr
Option c
if 3 people can sit in a triple seat, then we have 3t
for 1 (one) row, it would be 2d + 3t
Note that double seat =d and tripple seat=3d
Therefore, for r rowas, it would be r(2d+3t) = 2dr+3tr
Option c