With DS problems, I always ask myself the following three questions:
What do I want?
What do I have?
What do I need?
With DS problems, the goal is not to solve but to see whether the statement gives you sufficient information to solve. In other words: Is the statement giving me what I need?
In this case:
What do I want? What is the question asking for? In this case, the value of d rounded to the nearest tenth.
What do I have? Before I look at the two statements, what information have I been given? In this case, that d = .2h6
What do I need? In order to answer the question, what additional information is needed? In this case, the value of h. If h < 5, then rounded to the nearest tenth d = .2; if h >= 5, then rounded to the nearest tenth d = .3.
So when I examine the two statements, what I need is the answer to this question:
Is h < 5?
Statement 1: If d < .25, then h can't be 5, because .256 > .25. So statement 1 tells me that h < 5. SUFFICIENT.
Statement 2: This statement tells me outright that h < 5. SUFFICIENT.
Since each statement is sufficient, the correct answer is D.
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