= 20 cubic feet - 33279-11/16 cubic inches
= 1280-5/16 cubic inches.
But 1 cubic foot of iron weighs as much as 7.8 cubic feet of water, _i.
e._, 7.8 × 1000 ounces, or 7800 ounces.
1280-5/16 × 7800
∴ Weight of tank = ---------------- pounds.
1728 × 16
= 361.199 pounds, _Ans._
EXAMPLE: A wood pile is 8 feet high and 40 feet long. The sticks are 4
feet long. How many cords in it?
SOLUTION: Being 8 feet high, it is 2 cords high. 40 feet in length equal
5 cords in length. Hence, the pile contains 2 × 5 cords, or 10 cords.
To estimate a bin:
(1) Find the number of cubic feet in the bin.
(2) Divide the number of cubic feet by 1-1/4.
(3) The result is the number of bushels.
EXAMPLE: How many bushels will a bin hold, if its inside measurements
are, length 20 feet, width 12 feet, depth 8 feet?
SOLUTION: The number of cubic feet in a bin is 8 × 12 × 20, or 1920.
If 1 bushel contains 1-1/4 cubic feet, in 1920 cubic feet there are as
many bushels as 1-1/4 is contained times in 1920, or 1536.