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07 Feb 2020, 06:13
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
78% (01:08) correct
22%
(01:28)
wrong
based on 58
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of 10y + 17z ?
(1) x + 2y + 7z = 40
(2) 2x - 6y - 3z = 30
(1) x + 2y + 7z = 40
(2) 2x - 6y - 3z = 30
07 Feb 2020, 06:34
Kudos
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What is the value of 10y + 17z ?
(Statement1): x + 2y + 7z = 40
No info about what x is.
Insufficient
(Statement2): 2x - 6y - 3z = 30
No info about what x is.
Insufficient
Taken together 1&2,
x + 2y + 7z = 40 (multiply by 2)
2x + 4y + 14z = 80 (1)
2x - 6y - 3z = 30 (2)
—> subtract 1st equation from 2nd
10y + 17z = 50
Sufficient
The answer is C
Posted from my mobile device
(Statement1): x + 2y + 7z = 40
No info about what x is.
Insufficient
(Statement2): 2x - 6y - 3z = 30
No info about what x is.
Insufficient
Taken together 1&2,
x + 2y + 7z = 40 (multiply by 2)
2x + 4y + 14z = 80 (1)
2x - 6y - 3z = 30 (2)
—> subtract 1st equation from 2nd
10y + 17z = 50
Sufficient
The answer is C
Posted from my mobile device
11 Feb 2020, 23:26
Kudos
Bookmarks
Either Statement alone is Insufficient.
Combine both Statements and we can get the answer for 10y + 17z
Although no need to solve fully, we can get the blind idea anyway:
(1) (x + 2y + 7z = 40)*2 = 2x + 4y + 14z = 80
(2) 2x - 6y - 3z = 30
(1) - (2) => 10y + 17z = 50
Option C!
Combine both Statements and we can get the answer for 10y + 17z
Although no need to solve fully, we can get the blind idea anyway:
(1) (x + 2y + 7z = 40)*2 = 2x + 4y + 14z = 80
(2) 2x - 6y - 3z = 30
(1) - (2) => 10y + 17z = 50
Option C!
