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SAT Math : Algebra

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Example Questions

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Example Question #3 : How To Solve For A Variable As Part Of A Fraction

If $\dpi{100} \small z>0$ , what is 40 percent of $\dpi{100} \small 30z$ ?

Possible Answers:

$\dpi{100} \small 120z$

$\dpi{100} \small 30z$

$\dpi{100} \small 20z$

$\dpi{100} \small 5z$

$\dpi{100} \small 12z$

Correct answer:

$\dpi{100} \small 12z$

Explanation:

To find 40 percent of $\dpi{100} \small 30z$ multiply $\dpi{100} \small 30z\times 0.4$

The result is $\dpi{100} \small 12z$

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Example Question #4 : How To Solve For A Variable As Part Of A Fraction

Solve for .

$\frac{1}{3}(3x-6)+\frac{1}{2}(2x+4)=\frac{1}{5}(15x -5)$

Possible Answers:

$-3$

$2$

$0$

$-2$

Correct answer:

Explanation:

First distribute the fractions:

x-2 +x+2 =3x-1

Combine like terms:

2x=3x-1

x=1

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Example Question #5 : How To Solve For A Variable As Part Of A Fraction

Solve for $x$ .

$(2x+3)-3(x+5)=-(3x-4)$

Possible Answers:

$4$

$0$

$-8$

$-4$

Correct answer:

Explanation:

First distribute to eliminate the parentheses:

$2x+3-3x-15=-3x+4$

Then combine like terms:

$2x=16$

$x=8$

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Example Question #1 : How To Solve For A Variable As Part Of A Fraction

x = 1/2

What does 1/x + 1/(x + 4) equal?

Possible Answers:

20/9

4/9

9/2

Correct answer:

20/9

Explanation:

1/x + 1/(x+4) =

1/(1/2) + 1/ (1/2 + 4) =

1/ (1/2) + 1 / (9/2) =

2 + 2/9

20/9

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Example Question #1 : How To Solve For A Variable As Part Of A Fraction

Solve for .

$\frac{16}{x + 7} = \frac{2}{6}$

Possible Answers:

Correct answer:

Explanation:

Cross multiply. 96 = 2 (x+7)

Dsitribute. 96 = 2x + 14

Solve for . 96 - 14 = 2x

82 = 2x

41 = x

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Example Question #6 : How To Solve For A Variable As Part Of A Fraction

If x=-5 , what is the value of $\frac{x^{2}+20}{x-4}$ ?

Possible Answers:

Correct answer:

Explanation:

To solve this question, substitute -5 in for x in the numerator and denominator. Remember that the square of a negative number is positive.

45 / -9 = -5

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Example Question #1151 : Algebra

Solve:

$\frac{4}{11}x + 3 = 15$

Possible Answers:

x = 37

x = 29

$x = \frac{48}{11}$

x = 39

x = 33

Correct answer:

x = 33

Explanation:

We want to isolate the x. First, we take away 3 from both sides. Then we have:

$\frac{4}{11}x = 12$

To get x by itself, we multiply by the reciprocal on both sides.

Then, we have:

$x = 12 \times \frac{11}{4} = \frac{12}{1}\times\frac{11}{4} = \frac{132}{4} = 33$

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Example Question #1 : How To Solve For A Variable As Part Of A Fraction

If $\frac{6}{x}=\frac{9}{19}$ , then what is the value of ?

Possible Answers:

none of these

3/38

38/3

9/114

7/12

Correct answer:

38/3

Explanation:

cross multiply:

(6)(19) = 9x

114=9x

x = 38/3

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Example Question #1 : How To Solve For A Variable As Part Of A Fraction

$\dpi{100} \small \frac{4 }{x} = \frac{2}{25}$

Find x.

Possible Answers:

$\dpi{100} \small \frac{8}{25}$

$\dpi{100} \small 0.25$

$\dpi{100} \small 50$

None

$\dpi{100} \small \frac{25}{8}$

Correct answer:

$\dpi{100} \small 50$

Explanation:

Cross multiply:

$\dpi{100} \small 4 \times 25 = 2x$

$\dpi{100} \small 100 = 2x$

$\dpi{100} \small x = 50$

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Example Question #3 : How To Solve For A Variable As Part Of A Fraction

The numerator of a fraction is the sum of 4 and 5 times the denominator. If you divide the fraction by 2, the numerator is 3 times the denominator. Find the simplified version of the fraction.

Possible Answers:

$\frac{1}{2}$

$\frac{1}{3}$

Correct answer:

Explanation:

Let numerator = N and denominator = D.

According to the first statement,

N = (D x 5) + 4.

According to the second statement, N / 2 = 3 * D.

Let's multiply the second equation by –2 and add itthe first equation:

–N = –6D

+[N = (D x 5) + 4]

–6D + (D x 5) + 4 = 0

–1D + 4 = 0

D = 4

Thus, N = 24.

Therefore, N/D = 24/4 = 6.

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SAT Math : Algebra

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #3 : How To Solve For A Variable As Part Of A Fraction

Example Question #4 : How To Solve For A Variable As Part Of A Fraction

Example Question #5 : How To Solve For A Variable As Part Of A Fraction

Example Question #1 : How To Solve For A Variable As Part Of A Fraction

Example Question #1 : How To Solve For A Variable As Part Of A Fraction

Example Question #6 : How To Solve For A Variable As Part Of A Fraction

Example Question #1151 : Algebra

Example Question #1 : How To Solve For A Variable As Part Of A Fraction

Example Question #1 : How To Solve For A Variable As Part Of A Fraction

Example Question #3 : How To Solve For A Variable As Part Of A Fraction

All SAT Math Resources

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