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In the array of numbers to below, each number above the bottom row is equal to three times the number immediately below it. What is value of x + y ?
(A) –45
(B) –15
(C) –2
(D) 20
(E) 77
| 27 | x | 81 | -108 |
| 9 | -18 | 27 | -36 |
| 3 | -6 | y | -12 |
| 1 | -2 | 3 | -4 |
(A) –45
(B) –15
(C) –2
(D) 20
(E) 77
Source: Nova GMAT
Difficulty Level: 500
Difficulty Level: 500
16 May 2017, 00:48
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rohan2345
x = three times the number immediately below it, so x = 3*(-18) = -54;
y = three times the number immediately below it, so y = 3*3 = 9.
x + y = -54 + 9 = -45.
Answer: A.
sashiim20
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Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
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16 May 2017, 03:35
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In the array of numbers to below, each number above the bottom row is equal to three times the number immediately below it. What is value of x + y ?
27 x 81 –108
9 –18 27 –36
3 –6 y –12
1 –2 3 –4
Since each number above the bottom row is equal to three times the number immediately below it;
x = -18 *3 = -54
y = 3 * 3 = 9
x+y = -54 +9 = -45 ..... Answer A....
_________________
Kindly press "+1 Kudos" to appreciate
27 x 81 –108
9 –18 27 –36
3 –6 y –12
1 –2 3 –4
Since each number above the bottom row is equal to three times the number immediately below it;
x = -18 *3 = -54
y = 3 * 3 = 9
x+y = -54 +9 = -45 ..... Answer A....
_________________
Kindly press "+1 Kudos" to appreciate
