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Algebra and Functions Videos 140 videos
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SAT Math 7.1 Algebra and Functions 185 Views
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Description:
SAT Math 7.1 Algebra and Functions
SAT Math 7.1 Algebra and Functions
Transcript
- 00:02
Gettin' shmoopy with it...
- 00:05
The arithmetic mean of p numbers is k.
- 00:08
Twice the sum of those numbers is 240. What is p?
- 00:12
And here are the potential answers...
- 00:16
Okay, so we're on the lookout for p...
Full Transcript
- 00:21
We can find averages by taking the sum of numbers and
- 00:24
dividing the sum by the... number of numbers.
- 00:30
In this case, we know that the mean, or k,
- 00:34
equals the sum of the numbers divided by the number of numbers (p).
- 00:39
Since we know that twice the sum is 240, the actual sum is 120.
- 00:45
Our equation becomes k equals 120 over p.
- 00:48
Because we want to find p, not k, we just need to rework the
- 00:52
equation to isolate p from the rest of it.
- 00:55
And we get p equals 120 over k.
- 00:58
The answer is B.
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