Carcass 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
Here's another approach:
Let the three consecutive positive integers be 1, 2 and 3
That is, A = 3, B = 2, C = 1
What is the value of the expression 2A +B +3C?Well, if A = 3, B = 2, C = 1, then 2A +B +3C = 2(3) +2 +3(1) = 11
So, when A =
3, we find that A +B +3C =
11Now test the answer choices, to see which one yields an output of
11, when A =
3A. 6(
3) + 7 =
25 ELIMINATE
B. 5(
3) + 1 =
16 ELIMINATE
C. 5(
3) - 1 =
14 ELIMINATE
D. 6(
3) - 5 =
13 ELIMINATE
E. 6(
3) - 7 =
11 KEEP
Answer: