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1) Could be positive or negative depending on y and z.
E.g x = -1, y =10, z = 5 Then (x+y)/z = -1+10/5 = 9/5 > 0
E.g x = 1, y = 10, z = 5 Then (x+y)/z = 11/5 > 0
E.g x = -10, y = -1, z=-5 Then (x+y)/z = 11/5 > 0

Insufficient.

2) z<0. (x+y) must be negative. (x+y) < 0 ---> x < -y (x must be a negative number smaller than -y).

For II, x can be greater than 0 and still x+y < 0. e.g. x =5, y = -10.

ywilfred wrote:

1) Could be positive or negative depending on y and z. E.g x = -1, y =10, z = 5 Then (x+y)/z = -1+10/5 = 9/5 > 0 E.g x = 1, y = 10, z = 5 Then (x+y)/z = 11/5 > 0 E.g x = -10, y = -1, z=-5 Then (x+y)/z = 11/5 > 0

Insufficient.

2) z<0. (x+y) must be negative. (x+y) < 0 ---> x < -y (x must be a negative number smaller than -y).