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

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

The quotient of a fraction is 12x . If the numerator is 48x^3 , what is the value of the denominator?

Possible Answers:

.25x

6x^3

4x^2

576x^4

8x^2

Correct answer:

4x^2

Explanation:

Step 1: Set up the equation

$\frac{48x^3}{D}=12x$

Step 2: Solve for D

$\frac{48x^3}{D}=12x \rightarrow 48x^3= 12x \cdot D\rightarrow \frac{48x^3}{12x}=D$

D = 4x^2

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Example Question #2 : How To Solve For A Variable As Part Of A Fraction

Solve for :

$\frac{x+1}{4}-\frac{x}{3}=6$

Possible Answers:

x=26

x=-72

x=-69

x=60

x=42

Correct answer:

x=-69

Explanation:

Solve for x:

$\frac{x+1}{4}-\frac{x}{3}=6$

Step 1: Find the least common denominator, , and adjust the fractions accordingly:

$\left (\frac{3}{3} \right )\cdot \left ( \frac{x+1}{4} \right ) - \left ( \frac{4}{4} \right )\cdot \left ( \frac{x}{3} \right )=6$

$\left ( \frac{3x+3}{12} \right )-\left ( \frac{4x}{12} \right )=6$

Solve for :

$\frac{3x+3-4x}{12}=6$

3x+3-4x=72

-x=69

x=-69

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

Solve the following equation for the given variable:

$\frac{2}{3x}=4$

Possible Answers:

$x = \frac{1}{5}$

$x = \frac{3}{4}$

$x = \frac{1}{6}$

$x = \frac{8}{3}$

$x = \frac{3}{2}$

Correct answer:

$x = \frac{1}{6}$

Explanation:

To solve this equation we have to multiply both sides by the denominator to get rid of the fraction.

Doing this yields

2 = 12x

Then to solve the last step is to isolate the variable by dividing both sides by 12.
Thus,

$x = \frac{2}{12}=\frac{1}{6}$ .

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

For what value of is the equation $\frac{4}{12}=\frac{5}{x}$ true?

Possible Answers:

Correct answer:

Explanation:

When the equation is cross multiplied, it becomes

$\\ 4\cdot x=5\cdot 12 \\4x = 60$ .

Hence,

$x =\frac{60}{4}$ , or x=15 .

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

Solve the following equation for :

$\frac{36}{5x} = 4$ .

Reduce any fractions in your final answer.

Possible Answers:

$x = \frac{36}{20}$

$x = \frac{9}{5}$

x = 3

$x = \frac{5}{9}$

x = 5

Correct answer:

$x = \frac{9}{5}$

Explanation:

To solve an equation with a variable in a fraciton, treat the denominator as a constant value and multiply both sides of the equation by the denominator in order to eliminate it.
$\\5x * \left(\frac{36}{5x}\right) = 4 * 5x\\ \newline 36 = 20x \newline \newline \frac{36}{20} = x \\ \newline \frac{9}{5}= x$

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

Solve for : $\frac{x}{12}=3$

Possible Answers:

$\frac{1}{3}$

$\frac{1}{36}$

Correct answer:

Explanation:

To find the answer, multiply the right side by . The result is 36=x .

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

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

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 #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 #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 #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 #6 : 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

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