SAT Math : How to find the part from the whole with percentage

Study concepts, example questions & explanations for SAT Math

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Example Questions

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Example Question #31 : Percentage

An artist's new album sold  copies on its release date. If the U.S. makes up  of these sales, how many copies were sold on that day in the U.S.?

Possible Answers:

Correct answer:

Explanation:

Let's set up a proportion to solve this problem, where  represents the number of copies sold in the U.S. Remember that we can express  as a fraction.

Now, we can solve for the unknown by cross-multiplying. 

Example Question #32 : Percentage

Jane called one thousand times to tell you she's sorry. If you saw she was calling and let your phone go to voicemail  of the time, how many voicemails would you have received if she left one each time?

Possible Answers:

None of the given answers

Correct answer:

Explanation:

To solve this problem, we can set up a proportion. Remember we can express percentages as fractions. Let  represent the number of voicemails. 

Now, we can cross-multiply and solve for the unknown.

Example Question #32 : Percentage

 is what percentage of 

Possible Answers:

Cannot be determined

Correct answer:

Explanation:

To solve this we need to set up a proportion.

Now we cross multiply

Divide by 180.

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