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a + b = 5, b + c = 12, and c + a = 13. What is a + b + c?
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24 Nov 2021, 09:57
24 Nov 2021, 09:57
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Question Stats:
76% (01:16) correct
24% (00:19) wrong based on 25 sessions
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a + b = 5, b + c = 12, and c + a = 13. What is a + b + c?
(A) 13
(B) 15
(C) 17
(D) 19
(E) 20
(A) 13
(B) 15
(C) 17
(D) 19
(E) 20
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Re: a + b = 5, b + c = 12, and c + a = 13. What is a + b + c?
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24 Nov 2021, 12:13
24 Nov 2021, 12:13
2
Carcass wrote:
a + b = 5, b + c = 12, and c + a = 13. What is a + b + c?
(A) 13
(B) 15
(C) 17
(D) 19
(E) 20
(A) 13
(B) 15
(C) 17
(D) 19
(E) 20
Given: a + b = 5, b + c = 12, and c + a = 13
Add the 3 equations to get: (a + b) + (b + c) + (c + a) = 5 + 12 + 13
Simplify: 2a + 2b + 2c = 30
In other words: 2(a + b + c) = 30
Divide both sides by 2 to get: a + b + c = 15
Answer: B
gmatclubot
Re: a + b = 5, b + c = 12, and c + a = 13. What is a + b + c? [#permalink]
24 Nov 2021, 12:13
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