**ITT Technical Institute**

Framingham, Massachusetts

Quarter 2 CAD Mathematics

Instructor: Paul Burney

Name __________________________________

**Instructions:**

Please solve the following problems. Credit will be given for work completed so make sure to show it!

- Fill in the Gear Ratio chart below (30 points):

**Teeth on Driving Gear (A)****Teeth on Driven Gear (B)****Gear Ratio, A / B**50 10 __________ 15 9 __________ 28 __________ 3.5 30 __________ 3 : 5 __________ 18 1:3 __________ 12.15 1 to 2.25

- Solve the following proportions: (30 points)

- The drawing below is a scale drawing of a the original 1984
Macintosh 128 K computer. Answer the following questions about
it: (20 points)

- If the actual height of the computer is
1.25 feet, what is the actual width of the
computer?

- What is the scale of the drawing?

- If the actual height of the computer is
1.25 feet, what is the actual width of the
computer?
- A 20 foot long steel bar weighs 267 pounds. How much does an
8 foot long bar of the same steel weigh? (10 points)

- It takes five printing presses 3 hours to print the morning
edition of a newspaper. If one of the presses breaks, how long
does it take the other four presses to print the morning edition
of the newspaper? (10 points)