A neighborhood has provided trash cans to residents to dispose of their waste. All trash cans have a diameter of 1.5 meters and a height of 1.25 meters. What is the minimum number of trash cans required to dispose of 10 cubic meters of waste?
14
13
5
4

Question

A neighborhood has provided trash cans to residents to dispose of their waste. All trash cans have a diameter of 1.5 meters and a height of 1.25 meters. What is the minimum number of trash cans required to dispose of 10 cubic meters of waste? 
14
13 
5
4

shadowfiend · Answer

So first off, what is 10 cubic meters a measurement of? Area? Volume? Length? Height?

anonymous · Answer

@shadowfiend i think it might be 5 or 14

shadowfiend · Answer

Ok, how did you get to those answers?

anonymous · Answer

pi times radius^2 times height

shadowfiend · Answer

And what numbers did you plug in for radius and height?

anonymous · Answer

3.14 times .75^2 times 1.25

anonymous · Answer

u have to cut the diameter in half to find the radius

shadowfiend · Answer

Yep! So that gives us a volume of 2.2 cubic meters per trash can.

shadowfiend · Answer

We're trying to stash 10 cubic meters, so we can see how many trash cans of 2.2 cubic meters make 10.

anonymous · Answer

10/2.2= 4.5

anonymous · Answer

but id go with the 5

shadowfiend · Answer

Right! And since we can't just use half a trash can—we need the whole thing—that's right, we go with 5 :)

anonymous · Answer

awesome. @shadowfiend thanks for the help. you rock

shadowfiend · Answer

My pleasure :)