Tag: data sufficiency
GMAT OFFICIAL GUIDE DS Solution: Let’s sketch a diagram of the stairs. Keep in mind that we don’t know the number of stairs between the floors, but the problem …
GMAT OFFICIAL GUIDE DS Solution: We need to determine the probability that a boy will be selected to read, in a class of boys and girls. Statement One Alone: …
GMAT OFFICIAL GUIDE DS Solution: An easy way to solve the problem is to set up a double set matrix. In our matrix we’ll have two main categories: gender …
GMAT OFFICIAL GUIDE DS Solution: We need to determine the absolute value of x. Statement One Alone: x = -|x| If x = -|x|, then x must be negative …
