SAT Math : Other Percentage

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #102 : Percentage

What number is 30% of 90?

Possible Answers:

Correct answer:

Explanation:

Verbal cues include "is" and "of."  "Is" means equals and "of" means multiplication.

So the equation to solve becomes

Example Question #11 : How To Find Percentage

If the length of a rectangle is increased by 50% and with width of the same rectangle is decreased by 50%, what is the effect on the area of the rectangle? 

Possible Answers:

It is unchanged

It is increased by 50%

It is decreaed by 25%

It is decreased by 50%

It is increased by 25%

Correct answer:

It is decreaed by 25%

Explanation:

This is a good question to use random numbers. Lets use 100 and 10 as the lengths. That means the area = 100 x 10 = 1000

If we increase the length of the side measuring 100 by 50% = 150

If we decrease the length of the other side 50% = 5

Area = 150 x 5 = 750

We see that the area decreased by 250 or 25% decrease in area!

Example Question #104 : Percentage

If 80 percent of x is 200, what is 60 percent x?

Possible Answers:

250

200

175

150

225

Correct answer:

150

Explanation:

.80x=200

x=200/.80

x=250

.60 (x) = ?

.60 (250) = 150

Example Question #105 : Percentage

Seventeen percent of some number is 34. What is this number?

Possible Answers:

None of the available answers

Correct answer:

Explanation:

The algebraic expression is:

Example Question #271 : Arithmetic

What number is 125% of 60?

Possible Answers:

75

80

60

66

90

Correct answer:

75

Explanation:

Translate this into a mathematical equation:

x = 1.25 * 60

x = 75

Example Question #12 : Other Percentage

If 10% of x is equal to 25% of y, and y=16, what is the value of x?

Possible Answers:

4

6.4

40

64

24

Correct answer:

40

Explanation:

Find 25% of y:

16 \cdot 0.25 = 4

10% of x is equal to 4. Therefore, 0.1x = 4.

Divide both sides by 0.1 to find that x = 40.

Example Question #271 : Arithmetic

There are  registered students in the math club. Students are deciding what activity they could do for their end of semester event. They have three choices: rock climbing, bowling, or outdoor laser tag.  students vote for rock climbing,  students vote for bowling, and  students vote for outdoor laser tag.

What percent of students did not vote?

Possible Answers:

Correct answer:

Explanation:

The number of students who did not vote is:

The percent of students who did not vote is therefore:

 of the students did not vote.

Example Question #14 : Other Percentage

Joaquin is running for Prom King.  If he receives  of the votes from a senior class of  students, and  of the votes from a junior class of  students, how many votes did he receive in total?

Possible Answers:

Correct answer:

Explanation:

First, we find how many seniors voted for him:

0.30 * 200 = 60 seniors

Then we find how many juniors using the same method

0.60 * 250 = 150 Juniors

Finally, we add the two together

60 + 150 = 210 students total

Example Question #15 : Other Percentage

13 is what percent of 25? 

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we should set up the following proportion

where x is the percentage we are looking for.

To solve, simply cross multiply and solve for x.

Therefore, our answer is 52%.

Example Question #21 : Other Percentage

What percent of  is

Possible Answers:

Correct answer:

Explanation:

Let's set up a proportion to solve this problem.

We're looking for a percentage, .

Our answer is 

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