How many of the numbers x, y, and z are positive? x, y, and z are all less than 30.
(1) x + y + z = 61
(2) x + y = 35
(1) x + y + z = 61
(2) x + y = 35
How many of the numbers x, y, and z are positive? x, y, and z are all less than 30.
(1) x + y + z = 61
(2) x + y = 35
Statement 1.
If any of x, y or z is equal to zero, the other two have to be a min of 30.5 which goes against the fact that x, y, and z are all less than 30.
The condition holds true when x, y or z is negative. So all must be positive.
1 is sufficient.
Statement 2.
No data about z.
So, IMO (A).
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