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Ratios, Percentages, and Proportions Videos 55 videos

SAT Math 10.3 Geometry and Measurement
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ACT Math 4.4 Pre-Algebra 509 Views


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Description:

ACT Math: Pre-Algebra Drill 4, Problem 4. Using the information given, find out how many girls attend the school.

Language:
English Language

Transcript

00:03

Here's your shmoop du jour:

00:04

The ratio of boys to girls at the local middleschool is 3 to 4.

00:08

If there are 245 students at the school, how

00:11

many girls are there?

00:13

And here are the potential answers...

00:19

So obviously this is a GREAT school to attend if you're a boy who likes going out Saturday nights.

00:24

It's a simple ratio problem. The problem tells us that the boys to girls ratio is:

00:31

3x boys and 4x girls. Meaning... there are more girls than boys...

00:38

It also gives the TOTAL number of students, which is 245.

00:41

There's a simple ratio here. 4 out of 7 students are girls.

00:45

So the ratio is "4 is to 7 as x is to 245."

00:53

To get the answer, we cross multiply to get 7x equals 4 times 245...

00:58

...or 7x equals 980.

01:02

To solve for x... which is the number of boys in the school... we divide both sides by 7

01:07

to get x = 140.

01:09

The answer is E.

01:10

As in, "Edwina."

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