Posted by Willy on Wednesday, April 9, 2014 at 8:16pm.
The concrete for a sidewalk is being poured outside the perimeter of a new subdivision, which is a 280 ft. by 720 ft. rectangle. The building code requires that the sidewalk be 5 feet wide and 8 inches deep. How many cubic yards of concrete will need to be poured? How much will the concrete for the new subdivision cost if the price per cubic yard of concrete is $74.50 and an extra 5% of concrete is being ordered?

math  Reiny, Wednesday, April 9, 2014 at 8:35pm
Dimensions of the rectangle including the sidewalk is
290 by 730 , (added 5 feet on each side)
surface area of sidwwalk
= 290x730  280x720
=10100 ft^2
volume of sidwwalk
= 10100(8/12) ft^3
= 20200/3 ft^3
but we are ordering 5% extra
volume ordered
= 20200/3 (1.05)
= 7070 cubic ft
= 7070/27 cubic yards
= 261.85 cubic yards
BUT we will probably have to order 262 yds^3
for a cost of
262(74.50)
= $19,519.00

math  bryce yates, Wednesday, May 14, 2014 at 9:33am
$19,519.00

math  Catdaddy, Wednesday, May 14, 2014 at 9:37am
$1

math  babydoll099, Saturday, May 2, 2015 at 12:52pm
$19,519.000

math  coolddude, Wednesday, April 20, 2016 at 6:01pm
19,000,000,00000,000EWAHGQHGO[V
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