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!

1. 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

   
   
   
   
   
   
   
   
   
   
2. Solve the following proportions: (30 points)
   
   
   
   
   
3. 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?

4. A 20 foot long steel bar weighs 267 pounds. How much does an 8 foot long bar of the same steel weigh? (10 points)
   
   
   
   
   
   
   
   
   
   
   
5. 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)