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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 1.1 Elementary Algebra 441 Views
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Description:
ACT Math: Elementary Algebra Drill 1, Problem 1. What is Ben's current age?
- Elementary Algebra / Variables to express relationships
- Product Type / ACT English
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Chinese Subtitled
- Foreign Language / Spanish Subtitled
- Mathematics and Statistics Assessment / Modeling and Applications
- Pre-Algebra / Data collection, representation, and interpretation
- Elementary Algebra / Using variables to express functional relationships
Transcript
- 00:03
Everybody's shmoopin' at ya... you don't hear a word they're sayin...
- 00:07
In 7 years, Ben will be 6 times Jerry's current age.
- 00:11
You'd never know there was that big an age difference by looking at their picture.
- 00:15
What is Ben's current age if J = Jerry's current age and B = Ben's current age?
- 00:21
And here are the potential answers... OK so what is this question asking?
Full Transcript
- 00:30
It's asking for Ben's current age...
- 00:31
...but the key thing to notice is that the question is asking for the answer not in terms
- 00:36
of B, but in terms of J, Jerry years.
- 00:40
We can start with the variables B and J first.
- 00:42
We're told that, in 7 years, Ben will be 6 times Jerry's current age.
- 00:47
"In 7 years" means we add 7 to Ben's current age, and set that equal to 6J.
- 00:53
So we get B plus 7 equals 6J.
- 00:56
To isolate B by itself, we can subtract 7 from both sides and get B equals 6J minus
- 01:02
7... or the answer B.
- 01:05
As in, "Brownie Batter."
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