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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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