-------------------+------------------------------------------------
| QUANTITIES OF MATERIAL IN 1 CU. FT. OF CONCRETE
+---------+--------------+-----------------------
MIXTURE | Cement, | Sand, | Stone or Gravel,
| Barrel | Cu. Yard | Cu. Yard
-------------------+---------+--------------+-----------------------
1 : 2 : 4 Concrete| .058 | .0163 | .0326
1 : 2½ : 5 Concrete| .048 | .0176 | .0352
-------------------+---------+--------------+-----------------------
=Example=
Suppose the work consists of a concrete silo requiring in all 935 cubic
feet of concrete, of which 750 cubic feet is to be 1: 2: 4 concrete,
and 185 cubic feet is to be 1: 2½: 5 concrete. Also enough sand and
cement is needed to paint the silo inside and outside, in all 400
square yards of surface, with a 1: 1 mixture of sand and cement. One
cubic foot of 1: 1 mortar will paint about 15 square yards of surface
and requires 0.1856 barrels of cement and 0.0263 cubic yards of sand.
=Solution, Etc.=