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Ratios, Percentages, and Proportions Videos 55 videos

SAT Math 10.3 Geometry and Measurement
3336 Views

SAT Math 10.3 Geometry and Measurement. What is the ratio of birds to dogs?

SAT Math 2.1 Statistics and Probability
343 Views

SAT Math 2.1 Statistics and Probability. Which two items have the highest protein to fat ratio?

SAT Math 2.2 Statistics and Probability
242 Views

SAT Math 2.2 Statistics and Probability. What percent of her recommended daily intake of 2000 calories did she consume?

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Percents and Proportions 4514 Views


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Description:

Looking to con someone out of 40% of a pizza? You've come to the right place. Just don't try that on us.

Language:
English Language

Transcript

00:04

Percent and Proportions, a la Shmoop. Candace never got the popular boy.

00:10

Back in high school she had acne, headgear... and it was the 80's.

00:15

But now that she's on the show Life-Threatening Makeover...

00:18

...she's gotten a chemical peel, tooth veneers, Lasik eye surgery, liposuction and

00:24

hair extensions. Right now, she's about to get out of her

00:27

car and approach the boy she dreamed about all through high school..

00:30

...but she's parked under a tree... If two hundred pigeons sit in that tree and

00:35

25 percent of them poop on Candace, how many pigeons poop on Candace?

00:41

Percent means "per hundred".

00:43

We can write an equation that states:

00:46

Some part of the pigeons... over the whole number of pigeons... equals some percent

00:51

of 100.

00:54

Let's replace these words with variables.

00:58

A over B equals P over 100. Which numbers can we plug in?

01:04

B is our total number of pigeons, which we know is 200.

01:11

And P is our percent, which we know is 25.

01:14

Now the equation only has one variable, so let's solve for A.

01:21

Multiply both sides by 200, and we get A equals 25 times 2...

01:28

...which simplifies to 50. So 50 pigeons poop on Candace just as she

01:34

exits the car. Candace just can't catch a break.

01:37

Oh well, at least Blake didn't see.

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