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Ratios, Percentages, and Proportions Videos 55 videos

SAT Math 10.3 Geometry and Measurement
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SAT Math 10.3 Geometry and Measurement. What is the ratio of birds to dogs?

SAT Math 2.1 Statistics and Probability
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SAT Math 2.1 Statistics and Probability. Which two items have the highest protein to fat ratio?

SAT Math 2.2 Statistics and Probability
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SAT Math 2.2 Statistics and Probability. What percent of her recommended daily intake of 2000 calories did she consume?

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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

Language:
English Language

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.

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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