Question

HELP!!!!!


For a driveway that is 14 feet wide, 12 yards long, and 4 inches thick, how many CY of Portland cement concrete is required if the unit weight of PCC is assumed to be 150pcf? (Round up to the nearest CY)

Answer 1

Hi, Joseph,
this problem is much like the previous one we worked on, in that we're going to have to use conversion factors to end up with just one unit of measurement (cubic yards).
For practice, please do an Internet search to determine how many feet are in 1 yard. Also determine how many inches there are in 1 foot.

Let me know when you've found this info.

http://www.infoplease.com/ipa/A0001729.html

Answer 2

1 yard = 3 foot
1 inch = 0.833 foot

Answer 3

Cool. Or, 12 inches = 1 ft.

We need to find the volume of concrete needed to complete the driveway. We know that the driveway dimensions are (length)(width)(thickness):

Answer 4

\[(14 ft.) * (12 yds.)*(4 inches)=\frac{ 1 yd }{ 3 ft. }(14 ft.) * (12 yds.)*(4 inches)\]

Answer 5

If you'll multiply the first two factors together, "ft." will disappear and you'll have the driveway width in yards instead of in feet.

Answer 6

If I convert the 12 yards to feet and the 4 inches to feet first, and then multiply the 14feet times the 36feet (12yards to feet = 36feet) times 0.33 foot( 4inches to foot = 0.33 foot) I'm going to end up with Cubic Feet. so after that, I can convert the CF to CY.
If i do this… am I going to have the same result?

Answer 7

So long as your math is OK, yes, definitely you should get the same result. Which path you take is entirely up to you. In fact, you could do this problem both ways, compare your results and then decide which path you prefer.

Answer 8

ok thanks.
is that all or I have to do something else in this problem?

Answer 9

that's it!
sorry for the delay; I lost my Internet connection temporarily.

Answer 10

N/P
THANK YOU VERY MUCH.