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19 Feb 2019, 21:55
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
91% (01:15) correct
9%
(02:08)
wrong
based on 90
sessions
History
Date
Time
Result
Not Attempted Yet
If a + b − 2c = 12, and 3a + 3b + c = 22, what is the value of c ?
A. −2
B. 0
C. 10
D. 17
E. 34
A. −2
B. 0
C. 10
D. 17
E. 34
20 Feb 2019, 00:50
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Bookmarks
Bunuel
If a + b − 2c = 12, and 3a + 3b + c = 22, what is the value of c ?
A. −2
B. 0
C. 10
D. 17
E. 34
A. −2
B. 0
C. 10
D. 17
E. 34
a+b=12+2c
and
3*(a+b)+c=22
so
c=-2
IMO A
20 Feb 2019, 15:46
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Bunuel
If a + b − 2c = 12, and 3a + 3b + c = 22, what is the value of c ?
A. −2
B. 0
C. 10
D. 17
E. 34
A. −2
B. 0
C. 10
D. 17
E. 34
Given ,
a + b - 2c = 12
a + b = 12 + 2c
again
3a + 3b + c = 22
3( a + b) + c = 22
3( 12 + 2c) + c = 22
36 + 6c + c = 22
7c = -14
c = -2.
A is the correct answer.
