Let's try to answer the following Data Sufficiency
question using as little calculation as possible.
What is the value of x?
1) If x were the length of the diameter of a circle,
the area of the circle would be three times greater than the
radius.
2) If x were the length of the circumference of
a circle, the ratio of x to the radius would be 2? :1.
| |
 |
Statement 1 is sufficient. |
 |
Statement 1 is insufficient. |
|
Calculation is necessary. |
Countinue
We can indeed stop here. No more work is needed to
determine that this statement is sufficient to give us a single value
for x. The question is testing your understanding of the relationships
between the various measurements of a circle. And in the first statement,
we’ve been given a relationship between two measurements containing the
same and only variable, x. Remember that any measurement of a circle
can be found if you have any other measurement. So, if x is to
be the diameter of a circle, we can certainly represent the radius in
terms of x. This gives us an equation with only one variable, which
we can solve. Don’t believe it?
Check out the math.
Now let’s look at the other statement and decide when
we can stop.
Countinue
Next to display next topic in the chapter.
Test Prep Lessons With Video Lessons and Explained MCQ