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ACT Math: Elementary Algebra Drill 1, Problem 1. What is Ben's current age?
ACT Math: Elementary Algebra Drill 5, Problem 1. How old is Jeremy's brother?
ACT Math: Elementary Algebra Drill 5, Problem 4. How old is Thalia?
CAHSEE Math 1.4 Mathematical Reasoning 178 Views
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Description:
Mathematical Reasoning Drill 1 Problem 4. What other information is needed?
Transcript
- 00:03
Let’s see if you can shmoop what we’re layin' down...
- 00:07
In a math class, the teacher gives the students a pop quiz every week.
- 00:11
We know… she must have been commissioned by the devil.
- 00:17
The number of problems on each quiz is always the same.
- 00:20
If each problem on the quiz is always worth five points and takes an average of three minutes to finish,
Full Transcript
- 00:26
what other information is needed to find the number of problems on each weekly quiz?
- 00:31
And here are the potential answers...
- 00:36
OK, so this question is all about just reading and deducing the broader, factual story here…Sherlock.
- 00:42
By glancing at options C and D, we can see that we really just need to test the validity
- 00:46
of A and B to get our answer…
- 00:48
A suggests that we’d need the total number of points on each weekly quiz.
- 00:52
That makes sense. Say we know there are 50 points possible. We already know that each
- 00:57
problem is worth 5… 50 divided by 5 is 10, and we’d know there are just 10 problems.
- 01:03
A gets through to the lightning round.
- 01:07
What about B?
- 01:08
Here, it’s suggested that all we’d need is the amount of time allowed to complete the quiz.
- 01:13
Hey, what do you know… that works, too. If we’re told the class has an hour, we
- 01:17
can take 60 minutes divided by 3 minutes per problem to get… 20 problems.
- 01:22
B is also through to the lightning round.
- 01:26
Unfortunately for our two ultra-competitive contestants… there is no single winner here.
- 01:31
Both A and B are correct, so we’ve got ourselves a tie.
- 01:34
And we’ll want to go with choice C for our final answer.
- 01:37
As in C, “Class… NOT dismissed…”
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