ITT Technical Institute
Framingham, Massachusetts
Quarter 2 CAD Mathematics
Instructor: Paul Burney

Name __________________________________


Ratio and Proportion (Test #2)

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)







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

    2. 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)