ACT Math : Algebraic Fractions

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1244 : Algebra

Solve for \(\displaystyle x\).

\(\displaystyle \frac{x-3}{3}=\frac{12}{7}\)

Possible Answers:

\(\displaystyle \frac{49}{4}\)

\(\displaystyle \frac{57}{7}\)

\(\displaystyle \frac{40}{3}\)

\(\displaystyle \frac{58}{7}\)

Correct answer:

\(\displaystyle \frac{57}{7}\)

Explanation:

First, cross-multiply.

\(\displaystyle 7(x-3)=12(3)\)

Now, simplify and solve for \(\displaystyle x\).

\(\displaystyle 7x-21=36\)

\(\displaystyle 7x=57\)

\(\displaystyle x=\frac{57}{7}\)

Example Question #1245 : Algebra

Solve for \(\displaystyle x\).

\(\displaystyle \frac{2x+3}{4}=\frac{5}{3}\)

Possible Answers:

\(\displaystyle \frac{11}{6}\)

\(\displaystyle 2\)

\(\displaystyle \frac{17}{5}\)

\(\displaystyle \frac{4}{5}\)

Correct answer:

\(\displaystyle \frac{11}{6}\)

Explanation:

First, cross-multiply. 

\(\displaystyle 6x+9=20\)

Now, solve for \(\displaystyle x\).

\(\displaystyle 6x=11\)

\(\displaystyle x=\frac{11}{6}\)

Example Question #31 : How To Solve For A Variable As Part Of A Fraction

Solve for \(\displaystyle x\).

\(\displaystyle \frac{5}{3x-8}=\frac{7}{3}\)

Possible Answers:

\(\displaystyle \frac{21}{71}\)

\(\displaystyle -\frac{21}{71}\)

\(\displaystyle -\frac{71}{21}\)

\(\displaystyle \frac{71}{21}\)

Correct answer:

\(\displaystyle \frac{71}{21}\)

Explanation:

First, cross-multiply.

\(\displaystyle 3(5)=7(3x-8)\)

Now, simplify and solve for \(\displaystyle x\)

\(\displaystyle 15=21x-56\)

\(\displaystyle 71=21x\)

\(\displaystyle x=\frac{71}{21}\)

Example Question #1251 : Algebra

Solve for \(\displaystyle x\).

\(\displaystyle \frac{7x}{2}=\frac{5}{4}\)

Possible Answers:

\(\displaystyle \frac{7}{12}\)

\(\displaystyle \frac{1}{4}\)

\(\displaystyle \frac{2}{13}\)

\(\displaystyle \frac{5}{14}\)

Correct answer:

\(\displaystyle \frac{5}{14}\)

Explanation:

First, cross-multiply.

\(\displaystyle 7x(4)=5(2)\)

Now, simplify and solve for \(\displaystyle x\).

\(\displaystyle 28x=10\)

\(\displaystyle x=\frac{10}{28}=\frac{5}{14}\)

Example Question #31 : How To Solve For A Variable As Part Of A Fraction

Solve for \(\displaystyle x\).

\(\displaystyle \frac{4x}{3}=\frac{9}{5}\)

Possible Answers:

\(\displaystyle \frac{20}{27}\)

\(\displaystyle \frac{4}{7}\)

\(\displaystyle \frac{27}{20}\)

\(\displaystyle \frac{2}{5}\)

Correct answer:

\(\displaystyle \frac{27}{20}\)

Explanation:

First, cross-multiply.

\(\displaystyle 5(4x)=27\)

Now, solve for \(\displaystyle x\).

\(\displaystyle 20x=27\)

\(\displaystyle x=\frac{27}{20}\)

Example Question #81 : Algebraic Fractions

Solve for \(\displaystyle x\).

\(\displaystyle \frac{x}{7}=\frac{2}{3}\)

Possible Answers:

\(\displaystyle \frac{17}{4}\)

\(\displaystyle \frac{14}{3}\)

\(\displaystyle \frac{8}{7}\)

\(\displaystyle \frac{12}{3}\)

Correct answer:

\(\displaystyle \frac{14}{3}\)

Explanation:

First, cross-multiply.

\(\displaystyle 7(2)=3x\)

Now, solve for \(\displaystyle x\).

\(\displaystyle x=\frac{14}{3}\)

Example Question #3111 : Act Math

Solve for \(\displaystyle x\).

\(\displaystyle \frac{4x}{5}=\frac{2}{6}\)

Possible Answers:

\(\displaystyle \frac{5}{7}\)

\(\displaystyle \frac{1}{3}\)

\(\displaystyle \frac{5}{12}\)

\(\displaystyle \frac{7}{12}\)

Correct answer:

\(\displaystyle \frac{5}{12}\)

Explanation:

First, cross-multiply.

\(\displaystyle 24x=10\)

Now, solve for \(\displaystyle x\).

\(\displaystyle x=\frac{10}{24}\)

Simplify.

\(\displaystyle \frac{5}{12}\)

Example Question #34 : How To Solve For A Variable As Part Of A Fraction

Solve for \(\displaystyle x\).

\(\displaystyle \frac{2x-4}{5}=\frac{2}{5}\)

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle \frac{1}{2}\)

\(\displaystyle \frac{2}{3}\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 3\)

Explanation:

First, cross-multiply.

\(\displaystyle 10x-20=10\)

Now, solve for \(\displaystyle x\).

\(\displaystyle 10x=30\)

\(\displaystyle x=\frac{30}{10}=3\)

Example Question #32 : How To Solve For A Variable As Part Of A Fraction

Solve for \(\displaystyle x\).

\(\displaystyle \frac{4x-2}{3}=\frac{4}{3}\)

Possible Answers:

\(\displaystyle \frac{3}{2}\)

\(\displaystyle 2\)

\(\displaystyle \frac{7}{2}\)

\(\displaystyle \frac{1}{2}\)

Correct answer:

\(\displaystyle \frac{3}{2}\)

Explanation:

First, cross-multiply.

\(\displaystyle 3(4x-2)=12\)

Simplify.

\(\displaystyle 12x-6=12\)

Solve for \(\displaystyle x\).

\(\displaystyle 12x=18\)

\(\displaystyle x=\frac{18}{12}=\frac{3}{2}\)

Example Question #3112 : Act Math

Solve for \(\displaystyle x\).

\(\displaystyle \frac{3}{5-x}=\frac{2}{3}\)

Possible Answers:

\(\displaystyle \frac{3}{2}\)

\(\displaystyle 2\)

\(\displaystyle 0\)

\(\displaystyle \frac{1}{2}\)

Correct answer:

\(\displaystyle \frac{1}{2}\)

Explanation:

First, cross-multiply.

\(\displaystyle 9=10-2x\)

Now, solve for \(\displaystyle x\).

\(\displaystyle -1=-2x\)

\(\displaystyle \frac{1}{2}=x\)

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