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14 Jun 2016, 09:05
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
58% (02:04) correct
42%
(02:24)
wrong
based on 379
sessions
History
Date
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Not Attempted Yet
Company A has x mailing lists and Company B has y mailing lists. If the total mailing lists’ number combined Company A and Company B is equal to 3 times the mailing lists’ number of Company A, what is the number of mailing lists that both Company A and Company B have, in terms of x and y?
A. 2x-y
B. y-2x
C. 3x+y
D. y+2x
E. y-3x
*An answer will be posted in 2 days.
A. 2x-y
B. y-2x
C. 3x+y
D. y+2x
E. y-3x
*An answer will be posted in 2 days.
16 Jun 2016, 08:01
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a - lists that are only part of Company A ( A not B )
b - lists that are only part of Company B ( B not A )
c - lists that are part of both company A & B ( This is the overlap portion of the venn diagram)
X mailing lists = a + c
Y mailing lists = b + c
Total = X + Y - Both = a+c + b+c - c = a+b+c
As per the question
a+b+c = 3(a+c) --> b = 2(a + c) --> b = 2X
Y = 2X + c
c = Y-2X
b - lists that are only part of Company B ( B not A )
c - lists that are part of both company A & B ( This is the overlap portion of the venn diagram)
X mailing lists = a + c
Y mailing lists = b + c
Total = X + Y - Both = a+c + b+c - c = a+b+c
As per the question
a+b+c = 3(a+c) --> b = 2(a + c) --> b = 2X
Y = 2X + c
c = Y-2X
16 Jun 2016, 20:22
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(x-b)+b+(y-b)=3x, x+y-b=3x , therefore b=y-2x. Hence, the correct answer is B.
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