AkiB wrote:On the number line, if r<s, if p is halfway between rand s, and if t is halfway between p and r, then s- t/t-r =
(A) 1/4
(B) 1/3
(C) 4/3
(D) 3
(E) 4
Let r=1 and p=3.
Since t is halfway between r=1 and p=3, t=2.
Since p=3 is halfway between r=1 and s, s=5.
Thus, (s-t)/(t-r) = (5-2)/(2-1) = 3.
The correct answer is
D.
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