zatspeed wrote:
If r and s are positive integers and r-s=6, which of the following has the greatest value?
A. 2r
B. 2s
C. r +s
D. 2r-s
E. 2s-r
I am not entirely sure of the method I used and I got
D and E have answer value of 12
B has answer value of 12-r
A has answer value of 12+s
C, I am not even sure how to input the values for this one
The simplest way to do this is to assume values.
We are told that r and s are positive integers.
Also, r-s = 6 => r = 6+s
Hence r is 6 more than s.
Let s be 10. Hence r = 16.
Option A: 2r = 2*16 = 32
Option B: 2s = 2 * 10 = 20
Option C: r + s = 16 + 10 = 26
Option D: 2r - s = 2(16) - 10 = 32 - 10 = 22
Option E: 2s - r = 2(10) - 16 = 20 - 16 = 4
Hence option A is the greatest.
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