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Systems of Linear Equations and Inequalities Videos 9 videos
SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.
SAT Math 1.3 Algebra and Functions. How many 16 oz. bottles did she buy?
SAT Math 7.1 Algebra and Functions 185 Views
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Description:
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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