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SAT Math 1.4 Numbers and Operations. Solve the equation.
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
SAT Math 5.2 Numbers and Operations 200 Views
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Description:
SAT Math 5.2 Numbers and Operations
Transcript
- 00:02
To Shmoop or not to Shmoop. That is not this question. It's math.
- 00:08
The sum of three consecutive integers is 111.
- 00:11
What is the largest of the three numbers?
- 00:15
Alright, first of all, what is this question even asking? Well, it wants us to find 3 integers that,
- 00:20
when added together, total 111. But the key term here is CONSECUTIVE.
Full Transcript
- 00:26
Meaning that the numbers are all one apart...
- 00:37
And we're only interested in the largest one.
- 00:39
The best way to solve this is with a little algebra.
- 00:42
We’ll represent the smallest of the three numbers with the variable s.
- 00:47
The next number would be s + 1, and the largest number would be s + 2.
- 00:51
All three numbers added together equal 111.
- 00:55
And the equation then looks like: s + s + 1 + s + 2 equals 111.
- 01:01
Add like terms....s plus s plus s equals 3s…and 1 plus 2 equals 3.
- 01:08
So 3s + 3 equals 111. Subtract 3 from both sides to get 3s equals 108.
- 01:16
Divide both sides by 3 to get s equals 36.
- 01:21
If the smallest number, s, is 36, that means the largest number, s+2, is 38.
- 01:27
And we're done.
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