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Re: A, B, C are three consecutive positive integers (A>B>C). What is the
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05 Jul 2016, 12:48

3

1

A, B, C are three consecutive positive integers (A>B>C). What is the value of the expression 2A +B +3C?

=> A+A+(A-1)+3(A-2) Ans E. 6A-7.

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Good luck ========================================================================================= "If a street performer makes you stop walking, you owe him a buck" "If this post helps you on your GMAT journey, drop a +1 Kudo "

Re: A, B, C are three consecutive positive integers (A>B>C). What is the
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05 Jul 2016, 22:39

A= C+2 => C = A-2 A= B+1 => B = A-1

Since the answer options contain variable A , we have to write B and C in terms of A . 2A +B +3C = 2A + (A-1) +3(A-2) =2A + A-1 + 3A -6 =6A -7 Answer E
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Re: A, B, C are three consecutive positive integers (A>B>C). What is the
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02 Jul 2017, 14:43

Assign some simple values, A=3, B=2, C=1 2A+B+3C = 11 For questions of these type where GMAT asks the value, I always start from E. Lo and behold. E is the answer because 6*3-7=11
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I tried to solve it by two ways but only one works in this case. Please explain why so?

A= a B=a-1 C= a-2

We will get E as the answer after plugging in these values in the expression given.

But if we take:

A= a+2 B= a+1 C= a

2a+4+ a+1+ 3a = 6a+ 5

Where did I go wrong in the second method?

We need the value in terms of A. What is A in your second method? A = a + 2, so a = A - 2. Thus, 6a+ 5 = 6(A - 2) + 5 = 6A - 7 (Answer: E).
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Re: A, B, C are three consecutive positive integers (A>B>C). What is the
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16 Jul 2017, 17:33

Bunuel wrote:

A, B, C are three consecutive positive integers (A>B>C). What is the value of the expression 2A +B +3C?

A. 6A+7. B. 5A+1. C. 5A-1. D. 6A-5. E. 6A-7.

Since the integers A, B, and C are consecutive integers (with A > B > C) and we see that the answer choices are in terms of A, we can say B = A - 1 and C = A - 2. Thus: