Problem |
Solution |
3) Olga is building a cork board for her father. Her original dimensions for the board are 80 cm by 130 cm, but she decides to make each side 20% longer for the final construction. By what percent will the area of the board increase?
|
An increase of 20% is to multiply the dimension by 1.2.
To determine the percent increase you really don't need the actual dimensions!
|
4) A cylindrical grain silo measuring 20 feet tall with a diameter of 10 feet is being emptied. It takes 48 seconds to empty a cubic foot of grain. How long will it take to empty the silo if it started out full? Express your answer to the nearest minute.
|
- Volume of the silo = ___________ cu. ft.
- Time to empty = __________ minutes.
|
5) If you take a cube and shrink each length by a factor of 3, what is the ratio of the final surface
area to the initial surface area?.
|
Shrinking each length by a factor of 3 is multiplying each dimension by 1⁄3
|