THE QUESTION ASKS ABOUT THE SIGN OF D. (1) INSUFFICIENT
28. The question asks about the sign of d.
(1) INSUFFICIENT: When two numbers sum to a negative value, we
have two possibilities:
Possibility A: Both values are negative (e.g., e = -4 and d = -8)
Possibility B: One value is negative and the other is positive.(e.g., e
= -15 and d = 3).
(2) INSUFFICIENT: When the difference of two numbers produces
a negative value, we have three possibilities:
Possibility A: Both values are negative (e.g., e = -20 and d = -3)
Possibility B: One value is negative and the other is positive (e.g., e
= -20 and d = 3).
Possibility C: Both values are positive (e.g., e = 20 and d = 30)
(1) AND (2) SUFFICIENT: When d is ADDED to e, the result (-12) is
greater than when d is SUBTRACTED from e. This is only possible if
d is a positive value. If d were a negative value than adding d to a
number would produce a smaller value than subtracting d from that
number (since a double negative produces a positive). You can test
numbers to see that d must be positive and so we can definitively
answer the question using both statements.