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If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6

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If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6  [#permalink]

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New post 18 Feb 2019, 10:59
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If a – b = c, what is the value of b ?

(1) c + 6 = a

(2) a = 6

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Re: If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6  [#permalink]

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New post 18 Feb 2019, 11:03
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SajjadAhmad wrote:
If a – b = c, what is the value of b ?

(1) c + 6 = a

(2) a = 6


given a-b=c
or say b= a-c

#1
c+6=a
a-c=6
so b = 6
sufficient
#2
a=6
no value of c known
in sufficeint
IMO A
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Re: If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6  [#permalink]

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New post 19 Feb 2019, 00:30
a-b = c
a-c = b

St1:
c+6=a
6=a-c
Hence b=6
Sufficient

St2:
a=6
6-c=b
6=b+c
Insufficient

IMO A
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Re: If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6   [#permalink] 19 Feb 2019, 00:30
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If a – b = c, what is the value of b ? (1) c + 6 = a (2) a = 6

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