1. ## Word Problem Help...

[Problem 1]

the instructer of an introductory computer course wants to make a wall chart of a computer desktop for her students. To make it as realistic as possible, she would like the desktop icons to be proportional to the size of her 6' x 6' chart. If the icons on her 15" x 15" PC screen are 3/8" x 3/8", how large should they be on her wall chart?

[Problem 2]

In her morning class, the computer teacher has 20 students, 8 of whom are women and 12 of whom are men. If her afternoon class has 30 students, how many of them must be women so that both classes have the same ration of women to men?

[Problem 3]

The instructor has learned that for 30 students in her afternoon class, the ration of students who do not own a computer to those who do is 2 to 1. How many students in the class own thei own computer?

2. Originally Posted by IgnoranceIsBliss
[Problem 1]

the instructer of an introductory computer course wants to make a wall chart of a computer desktop for her students. To make it as realistic as possible, she would like the desktop icons to be proportional to the size of her 6' x 6' chart. If the icons on her 15" x 15" PC screen are 3/8" x 3/8", how large should they be on her wall chart?

Find the scale factor of the icons on the PC screen to the size of the screen:

$\displaystyle S. \ \ F.=\frac{\frac{3}{8}}{15}=\frac{1}{40}$

So, the icons on the wall chart will be

$\displaystyle \frac{1}{40}\cdot72=1.8$ inches square.

3. Originally Posted by IgnoranceIsBliss
[Problem 2]

In her morning class, the computer teacher has 20 students, 8 of whom are women and 12 of whom are men. If her afternoon class has 30 students, how many of them must be women so that both classes have the same ration of women to men?

Morning Class (20 students: 8 women, 12 men)

Ratio of women to total = 8/20 = 2/5

Ratio of men to total = 12/20 = 3/5

Afternoon Class (30 students)

Ratio of women to total must be 2/5, so 2/5(30)= 12 women.

Ratio of men to total must be 3/5. so 3/5(30) = 18 men.

4. Originally Posted by IgnoranceIsBliss

[Problem 3]

The instructor has learned that for 30 students in her afternoon class, the ration of students who do not own a computer to those who do is 2 to 1. How many students in the class own thei own computer?

$\displaystyle \frac{don't}{do}=\frac{2}{1}$