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ACT Mathematics Videos 164 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?
ACT Math 5.1 Elementary Algebra 263 Views
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Description:
ACT Math: Elementary Algebra Drill 5, Problem 1. How old is Jeremy's brother?
Transcript
- 00:03
A little birdie told us you wanted to solve a shmoopy math problem...
- 00:07
Jeremy is one year older than twice his brother's age.
- 00:11
If Jeremy is 17, how old is his brother? And why don't we get to know his name?
- 00:19
And here are the potential answers...
- 00:23
First of all, don't get hung up on the fact
Full Transcript
- 00:25
that we don't get to find out Jeremy's brother's name.
- 00:27
With short problems like this, it's a good idea not to get too attached to the characters.
- 00:32
OK so what is this question asking?
- 00:34
It wants us to translate English into...Mathlish.
- 00:38
So here we go:
- 00:40
Jeremy equals 1 plus the quantity 2 times his brother's age.
- 00:44
And we know that Jeremy is 17.
- 00:46
So we substitute 17 for J and get 17 equals 1 plus 2b.
- 00:53
Subtract 1 from both sides and we have 16 equals 2b.
- 00:57
Divide both sides by 2 and we get... 8.
- 01:00
Answer A.
- 01:01
Now take a second to say good-bye to Jeremy's brother. You won't be seeing him again.
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