SOLUTION: Determine number of bricks needed; A wall is 17 ft. in height and 11 ft. in length. 1/2 in. mortar is used. Brick dimensions are 2 3/4 in. high, 4 1/4 in. wide, and 8 1/2

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Question 1131160: Determine number of bricks needed;
A wall is 17 ft. in height and 11 ft. in length.
1/2 in. mortar is used.
Brick dimensions are 2 3/4 in. high, 4 1/4 in. wide, and 8 1/2 in. long. (Nominal dimensions are 2 1/4, 3 3/4, and 8.)


17 * 11 = 187 sq. ft. (wall area)
2.75 * 4.25 * 8.5 = 99.34375 = .6898871 sq. ft. (brick area)
Not sure how to continue.


Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
A wall is 17ft in height and 11ft in length.
%281%2F2%29in mortar is used: .
Brick dimensions are
2+3%2F4+in high, =>%2811%2F4%29in
4+1%2F4+in wide, =>%2817%2F4%29in
8+1%2F2+in long=>%2817%2F4%29in
(Nominal dimensions are 2+1%2F4, 3+3%2F4, and 8.) =>%281%2F2%29in mortar is already added and we got dimensions above

17+%2A+11+=+187ft%5E2 (wall area)
brick area: we need only length and height
%2817%2F4+%29%2A+%2811%2F4+%29+=+%28187%2F16%29ft%5E2 (brick area)

divide the wall area by brick area
+187ft%5E2%2F%28187%2F16%29ft%5E2=187%2F%28187%2F16%29=%28187%2A16%29%2F187=16=> the number of bricks needed

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

The solution by the tutor @MathLover1 is incorrect,

since she uses dimensions of the wall in feet, while dimensions of bricks in inches.


All dimensions must be in uniform (consistent) units !