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ACT Math: Pre-Algebra Drill 5, Problem 2. If a and b are prime numbers, how many factors does ab have?
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SAT Math 5.6 Numbers and Operations 3621 Views
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Description:
SAT Math 5.6 Numbers and Operations
Transcript
- 00:02
Incoming Shmoopy question at five o'clock! Everyone duck.
- 00:07
If 3/5 of the students in a class are male, and there are twelve females in the class, how many males are there?
- 00:18
We’ve got male… the question is: how many?
- 00:21
Before we find out how many males there are, we need to
- 00:24
calculate how many students there are in the entire class.
Full Transcript
- 00:27
If three-fifths of the students in a class are male,
- 00:31
it means that two-fifths of the students in the class are female—
- 00:35
Since we already know the total number of females,
- 00:37
we can put together a little equation to figure out the total number of students:
- 00:42
2/5 times the total number of students in the class equals 12.
- 00:46
Multiply both sides by the reciprocal of 2/5…
- 00:49
…and we find that there are 30 students in the class.
- 00:52
Now, all we need to find is 3/5 of 30.
- 00:55
Multiply 30 by 3/5 to get that there are 18 males in the class.
- 00:59
That's it.
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