Civil Engineering Reference
In-Depth Information
The solution:
5
1
0
/
6
/
×
1
0
/
/
0
/
0
×
15
=
5
×
15
=
$75
1
0
/
/
0
×
1
/
2
2
Example
If eight men in fifteen 8-hour days can throw 1000 cubic
yards of gravel into wheelbarrows, how many men will be required
to throw 2000 cubic yards of gravel into wheelbarrows in 20 days
of 6 hours each?
The solution:
/
/
324
2
1
/
/
5
×
/
8
×
/
8
×
/
2
0
/
/
0
/
0
=
2
×
4
×
2
=
16 men
/
2
0
/
×
/
6
×
/
1
/
0
/
0
/
0
2
Example
A building that is 30 feet
/
4
/
30 feet with a 10-foot ceiling
contains approximately 700 pounds of air. What will be the weight
of the air in a room 120 feet long, 90 feet wide, and 16 feet high?
The solution:
43
×
0
/
1
/
2
/
0
×
/
9
/
0
×
16
×
7
0
/
0
/
=
4
×
3
×
16
×
70
=
13
,
440 pounds
/
/
×
/
/
×
/
/
3
0
3
0
1
0
Decimals
Decimal
means numbering that proceeds by
tens
, and
decimal frac-
tions
(usually simply called
decimals
) are formed when a unit is
divided into ten parts. When decimals are written, the point where
the numbers start is called the
decimal point
. To the left of the dec-
imal point, the numbers read in the regular manner—units, tens,
hundreds, thousands, ten thousands, hundred thousands, millions,
and so forth. To the right of the decimal point, the figures are frac-
tional, reading, from the point, tenths, hundredths, thousandths,
ten thousandths, hundred thousandths, millionths, and so forth.
(see Figure 5-4).
The common fraction
6
/
10
can be expressed decimally as .6, and
the fraction
105
/
1000
can be written as .105. The mixed number
106
6
/
100
may be expressed decimally as 106.06. The decimal .6 is
read “six-tenths,” the same as the common fraction
/
10
, and the
decimal 106.06 is read “one hundred six
and
six-hundredths,” the
same as the mixed number.
6
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