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SAT Math : How to solve for a variable as part of a fraction

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Example Questions

Example Question #1156 : Algebra

Solve:

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

Possible Answers:

x = 39

x = 37

x = 29

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

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 #2 : 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:

38/3

3/38

7/12

9/114

none of these

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:

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

$\dpi{100} \small 0.25$

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

$\dpi{100} \small 50$

None

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:

$\frac{1}{3}$

$\frac{1}{2}$

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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Example Question #11 : How To Solve For A Variable As Part Of A Fraction

Solve for x:

$\frac{x-67}{-x+85}=\frac{3}{6}$

Possible Answers:

$\frac{9}{657}$

$\frac{1}{2}$

657

$\frac{9}{1}$

Correct answer:

Explanation:

In order to solve for x, you must cross multiply the ratio first. They will be equal to each other. 6(x-67)=3(-x+85)

6x-402=-3x+255 , you then can add 3x to both sides and 402 to both sides as well. You are left with:

9x=657 divide both sides by 9 to get the final answer:

x=73

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SAT Math : How to solve for a variable as part of a fraction

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #1156 : Algebra

Example Question #2 : 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

Example Question #11 : How To Solve For A Variable As Part Of A Fraction

All SAT Math Resources

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