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Ratios, Percentages, and Proportions Videos 55 videos
In this GED math problem, figure out what fraction of Serena's monthly income is spent on groceries
Pick the expression that best represents the cost in dollars of riding m miles in a taxi.
SAT Math 10.3 Geometry and Measurement. What is the ratio of birds to dogs?
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.
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
Full Transcript
- 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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