math question

bstewert · Jul 11, 2013

Here's a quick math problem, which will be easy for some of you:

Yesterday I saw a huge plastic tank laying on its side on a flatbed truck, maybe for
underground water storage. The shape was like a 55-gal drum, except it was
12' in diameter and 20' long. How would you calculate how many gallons it would hold?

I wonder what would be stored in it, besides water.

Cobleskill · Jul 11, 2013

pi r squared is area of circle, times length is volume. 7.5 gallons per cubic foot

Cobleskill · Jul 11, 2013

I would think it might be a fuel tank.

Dave Shepard · Jul 11, 2013

I got 16,956 gallons.

lumberjack · Jul 11, 2013

6x6x3.14x20x7.48= 16,910 gallons.

Dave Shepard · Jul 11, 2013

7.48g/ft[SUP]3[/SUP] I'll have to remember that.

treesmith · Jul 12, 2013

Only a persnickety fellow would squabble over 2/100 of a gallon per cubic foot!

lumberjack · Jul 12, 2013

Hahaha

bstewert · Jul 12, 2013

From my Boing engineer friend:

Hello Bob,
The volume of a cylinder (or any regular solid) is the product of its area
and its length. In this case the cross-sectional area is 6ft * 6ft * 3.14 =
113 sq ft. If the length is 20 ft, then the volume is 20ft * 113 sq ft =
2260 cubic ft.

There are about 7.48 gallons per cubic foot, so the total volume of the tank
is 7.48 gal per cu ft * 2260 cu ft= 16,905 gallons. That is enough to cover
one acre of ground with about 1/2 inch of water. Or beer.

Makes me thirsty.

math question

More options

bstewert

TreeHouser

Cobleskill

Treehouser

Cobleskill

Treehouser

Dave Shepard

Square peg, round world.

lumberjack

Young man on the go

Dave Shepard

Square peg, round world.

treesmith

Banned

lumberjack

Young man on the go

bstewert

TreeHouser

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