Card 0 of 1488
What is the value of z?
Statement 1:
Statement 2:
To solve for three variables, you must have three equations. Statements 1 and 2 together only give two equations, so the statements together are not sufficient.
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Is the equation linear?
Statement 1:
Statement 2: is a constant
If we only look at statement 1, we might think the equation is not linear because of the term. But statement 2 tells us the
is a constant. Then the equation is linear. We need both statements to answer this question.
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Data sufficiency question- do not actually solve the question
Solve for :
1.
2.
When solving an equation with 2 variables, a second equation or the solution of 1 variable is necessary to solve.
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Data Sufficiency Question
Solve for and
.
1.
2. Both and
are positive integers
Using statement 1 we can set up a series of equations and solve for both and
.
Additionally, the information in statement 2 indicates that there is only one possible solution that satisfies the requirement that both are positive integers.
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Solve the following for x:
4x+7y = 169
1. x > y
2. x - y = 12
To solve with 2 unknowns, we must create a system of equations with at least 2 equations. Using statement 2 as a second equation we can easily get our answer. Solve statement 2 for x or y, and plug in for the corresponding variable in the equation given by the problem.
So, solving statement 2 for x, we get x=12+y. Replacing x in the equation from the problem, we get 4(12+y) + 7y=169. We can distribute the 4, and combine terms to find 48+11y=169. Subtract 48 from both sides, we get 11y=121. So y=11. Reusing either equation and plugging in our y value gives our x value. So x - 11=12, or x=23. This shows that x > y, and statement 1 is true. But even though it's true, it is completely unneccessary information. Therefore the answer is that we only need the information from statement 2, and statement 1 is not needed.
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How many solutions does this system of equations have: one, none, or infinitely many?
Statement 1:
Statement 2:
If the slopes of the lines are not equal, then the lines intersect at one solution; if they are equal, then they do not intersect, or the lines are the same line. Write each equation in slope-intercept form, :
The slopes of the lines are .
We need to know both and
in order to determine their equality or inequality, and only if they are unequal can we answer the question.
Set and
.
The slopes are unequal, so the lines intersect at one point; the system has exactly one solution.
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Given that both , how many solutions does this system of equations have: one, none, or infinitely many?
Statement 1:
Statement 2:
If the slopes of the lines are not equal, then the lines intersect at one solution. If the slopes are equal, then there are two possibilties: either they do not intersect or they are the same line. Write each equation in slope-intercept form:
The slopes of these lines are .
If Statement 1 is true, then we can rewrite the first slope as , meaning that the lines have unequal slopes, and that there is only one solution. Statement 2 tells us the value of
, which is irrelevant.
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Data Sufficiency Question
Solve for and
:
1.
2.
In order to solve an equation set, one requires a number of equations equal to the number of variables. Therefore, either of the statements allow the problem to be solved.
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Data Sufficiency Question
Solve for ,
, and
:
1.
2.
In order to solve an equation set, one requires a number of equations equal to the number of variables. Therefore, three equations are needed and both statements are required to solve the problem.
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Given that , evaluate
.
Statement 1:
Statement 2:
Solve for in each statement.
Statement 1:
Statement 2:
From either statement alone, it can be deduced that .
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A toy store sells dolls for dollars each and trucks for
dollars each. How many dolls did the store sell last week?
(1) Last week, the store sold twice as many trucks as dolls.
(2) Last week, the store made ,
dollars from selling trucks and dolls.
Let:
t: the number of trucks sold last week
d: the number of dolls sold last week - d is the value we are looking to find
To evaluate the statements, we translate the word problems into equations
(1): or
(2):
Each statement provides a single equation with two unknowns which is unsolvable, so each statement alone is not enough.
The two statements taken together give us a system of two equations with two unknowns, which we can solve.
Therefore the right answer is C.
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is an integer. Is there a real number
such that
?
Statement 1: is negative
Statement 2: is even
The equivalent question is "does have a real
root?"
If you know only that is negative, you need to know whether
is even or odd; negative numbers have real odd-numbered roots, but not real even-numbered roots.
If you know only that is even, you need to know whether
is negative or nonnegative; negative numbers do not have real even-numbered roots, but nonnegative numbers do.
If you know both, however, then you know that the answer is no, since as stated before, negative numbers do not have real even-numbered roots.
Therefore, the answer is that both statements together are sufficient to answer the question, but neither statement alone is sufficient to answer the question.
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Which is the greater quantity, or
- or are they equal?
Statement 1:
Statement 2:
From Statement 1 alone,
Now assume Statement 2 alone. We show that this is insufficient with two cases:
Case 1:
;
; therefore,
Case 1:
;
; therefore,
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Does exist?
Statement 1: and
are both negative.
Statement 2: divided by 2 yields an integer.
A logarithm can be taken of a number if and only if the number is positive. If Statement 1 alone is true, then , being the product of two negative numbers, must be positive, and
exists.
Statement 2 is irrelevant; 4 and both yield integers when divided by 2, but
and
does not exist.
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Johnny was assigned to write a number in scientific notation by filling the circle and the square in the pattern below with two numbers.
Johnny filled in both shapes with numbers. Did he succeed?
Statement 1: He filled in the circle with the number "10".
Statement 2: He filled in the square with a negative integer.
The number is a number written in scientific notation if and only of two conditions are true:
is an integer
By Statement 1 Johnny filled in the circle incorrectly, since it makes .
By Statement 2, Johnny filled in the square correctly, but the statement says nothing about how he filled in the circle; Statement 2 leaves the question open.
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Solve the following rational expression:
(1)
(2)
When replacing m=5 in the expression we get:
Therefore statement (1) ALONE is not sufficient.
When replacing m=2n in the expression we get:
Therefore statement (2) ALONE is sufficient.
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Is ?
(1)
(2)
From statement 1 we get that and
.
So the first term is positive and the second term is negative, which means that is negative; therefore the statement 1 alone allows us to answer the question.
Statement 2 tells us that . If
, we have
which is less than
. Therefore in this case
.
For , we have
which is greater than
. So in this case
.
So statement 2 is insufficient.
Therefore the correct answer is A.
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is a number not in the set
.
Of the elements , which is the greatest?
Statement 1: is a negative number.
Statement 2:
Statement 1 alone is inconclusive, as can be demonstrated by examining two negative values of other than
.
Case 1: .
Then
is the greatest of these values.
Case 2:
Then
is the greatest of these values.
Now assume Statement 2 alone. Either or
.
Case 1: .
Then , so
; similarly,
.
is the greatest of the three.
Case 2: .
Odd power is negative, and even powers
and
are positive, so one of the latter two is the greatest. Since
, it follows that
. It then follows that
, or
.
Again, is the greatest of the three.
Statement 2 alone is sufficient, but not Statement 1.
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Note: Figure NOT drawn to scale.
Examine the above diagram. True or false: .
Statement 1:
Statement 2: and
have the same perimeter.
From Statement 1 alone, it follows by the similarity of the triangles that . These are congruent inscribed angles of a circle, which intercept congruent arcs, so
. Since congruent arcs have congruent chords,
.
Statement 2 alone only tells us the relative perimeters of the triangles. We have no way of determining the individual sidelengths or angle measures relative to each other, so Statement 2 alone is inconclusive.
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is a nonzero number. Is it negative or positive?
Statement 1:
Statement 2:
Both statements together are inufficient to produce an answer. For example,
If , then
and
.
If , then
and
.
In both cases, and
, but the signs of
differ between cases.
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