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ACT Math : How to evaluate a fraction

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Example Question #12 : How To Evaluate A Fraction

If pizzas cost dollars and sodas cost dollars, what is the cost of pizzas and sodas in terms of and ?

Possible Answers:

$5x+\frac{3y}{15}$

3x+5y

15x+5y

$\frac{3x+5y}{15}$

15xy

Correct answer:

$\frac{3x+5y}{15}$

Explanation:

If 10 pizzas cost x dollars, then each pizza costs x/10. Similarly, each soda costs y/6. We can add the pizzas and sodas together by finding a common denominator:

$2*\frac{x}{10}+2*\frac{y}{6}=\frac{x}{5}+\frac{y}{3}=\frac{3x}{3*5}+\frac{5y}{5*3}=\frac{3x+5y}{15}$

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Example Question #11 : How To Evaluate A Fraction

Gre9

According the pie chart, the degree measure of the sector representing the number of workers spending 5 to 9 years in the same role is how much greater in the construction industry chart than in the financial industry chart?

Possible Answers:

$25^{\circ}$

$18^{\circ}$

$70^{\circ}$

$35^{\circ}$

$7^{\circ}$

Correct answer:

$25^{\circ}$

Explanation:

Since the values in the pie charts are currently in terms of percentages (/100), we must convert them to degrees (/360, since within a circle) to solve the question. The "5 to 9 years" portion for the financial and construction industries are 18 and 25 percent, respectively. As such, we can cross-multiply both:

18/100 = x/360

x = 65 degrees

25/100 = y/360

y = 90 degrees

Subtract: 90 – 65 = 25 degrees

Alternatively, we could first subtract the percentages (25 – 18 = 7), then convert the 7% to degree form via the same method of cross-multiplication.

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Example Question #11 : How To Evaluate A Fraction

6 contestants have an equal chance of winning a game. One contestant is disqualified, so now the 5 remaining contestants again have an equal chance of winning. How much more likely is a contestant to win after the disqualification?

Possible Answers:

$\frac{1}{2}$

$\frac{1}{30}$

$\frac{1}{5}$

$\frac{2}{5}$

$\frac{1}{6}$

Correct answer:

$\frac{1}{30}$

Explanation:

When there are 6 people playing, each contestant has a 1/6 chance of winning. After the disqualification, the remaining contestants have a 1/5 chance of winning.

1/5 – 1/6 = 6/30 – 5/30 = 1/30.

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Example Question #13 : How To Evaluate A Fraction

Simplify:

$\frac{\frac{1}{4}+\frac{5}{7}}{\frac{2}{5}}$

Possible Answers:

$\frac{27}{70}$

$\frac{135}{56}$

$\frac{81}{7}$

$\frac{47}{5}$

$\frac{98}{71}$

Correct answer:

$\frac{135}{56}$

Explanation:

Begin by simplifying the numerator.

$\frac{1}{4}+\frac{5}{7}$ has a common denominator of . Therefore, we can rewrite it as:

$\frac{7}{28}+\frac{20}{28}=\frac{27}{28}$

Now, in our original problem this is really is:

$\frac{\frac{27}{28}}{\frac{2}{5}}$

When you divide by a fraction, you really multiply by the reciprocal:

$\frac{\frac{27}{28}}{\frac{2}{5}}=\frac{27}{28} \cdot\frac{5}{2}=\frac{135}{56}$

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Example Question #14 : How To Evaluate A Fraction

Simplify:

$\frac{\frac{81}{5}+\frac{7}{25}}{\frac{1}{9}-\frac{2}{7}}$

Possible Answers:

$-\frac{551}{12}$

$\frac{8414}{41}$

$-\frac{25956}{275}$

$-\frac{4532}{1575}$

$\frac{8417}{14}$

Correct answer:

$-\frac{25956}{275}$

Explanation:

Begin by simplifying the numerator and the denominator.

Numerator

$\frac{81}{5}+\frac{7}{25}$ has a common denominator of . Therefore, we have:

$\frac{405}{25}+\frac{7}{25} = \frac{412}{25}$

Denominator

$\frac{1}{9}-\frac{2}{7}$ has a common denominator of . Therefore, we have:

$\frac{7}{63}-\frac{18}{63}=-\frac{11}{63}$

Now, reconstructing our fraction, we have:

$\frac{\frac{412}{25}}{-\frac{11}{63}}$

To make this division work, you multiply the numerator by the reciprocal of the denominator:

$\frac{\frac{412}{25}}{-\frac{11}{63}} = \frac{412}{25} \cdot -\frac{63}{11} =-\frac{25956}{275}$

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Example Question #11 : How To Evaluate A Fraction

Simplify: $(\frac{x-4}{0.5})\div (\frac{1}{x+4})$

Possible Answers:

$\frac{3}{2x^2}-16$

2x^2-32

$\frac{1}{2}$

None of the other answer choices are correct.

Correct answer:

2x^2-32

Explanation:

Recall that dividing is equivalent multiplying by the reciprocal. Therefore, ((x - 4) / (1 / 2)) / (1 / (x + 4)) = ((x - 4) * 2) * (x + 4) / 1.

Let's simplify this further:

(2x – 8) * (x + 4) = 2x² – 8x + 8x – 32 = 2x² – 32

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Example Question #16 : How To Evaluate A Fraction

Solve for :

$\frac{3x}{8}+12=\frac{1}{3}-2x$

Possible Answers:

$\frac{43}{2}$

$-\frac{5}{7}$

$-\frac{280}{57}$

$\frac{100}{21}$

$-\frac{81}{13}$

Correct answer:

$-\frac{280}{57}$

Explanation:

Begin by isolating the variables:

$\frac{3x}{8}+2x=\frac{1}{3}-12$

Now, the common denominator of the variable terms is . The common denominator of the constant values is . Thus, you can rewrite your equation:

$\frac{3x}{8}+\frac{16x}{8}=\frac{1}{3}-\frac{36}{3}$

Simplify:

$\frac{19x}{8}=-\frac{35}{3}$

Cross-multiply:

19x * 3 = -35*8

Simplify:

57x = -280

Finally, solve for :

$x = -\frac{280}{57}$

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Example Question #1 : How To Evaluate A Fraction

Evaluate when x=11. Round to the nearest tenth.

Possible Answers:

0.3

0.2

1.9

1.8

Correct answer:

1.8

Explanation:

Wherever there is an x, plug in 11 and perform the given operations. The numerator will be equal to 83 and the denominator will be equal to 46. 83 divided by 46 is equal to 1.804… and since the second decimal place is not greater than or equal to 5, the first decimal place stays the same when rounding so the final answer is 1.8.

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ACT Math : How to evaluate a fraction

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #12 : How To Evaluate A Fraction

Example Question #11 : How To Evaluate A Fraction

Example Question #11 : How To Evaluate A Fraction

Example Question #13 : How To Evaluate A Fraction

Example Question #14 : How To Evaluate A Fraction

Example Question #11 : How To Evaluate A Fraction

Example Question #16 : How To Evaluate A Fraction

Example Question #1 : How To Evaluate A Fraction

All ACT Math Resources

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