the opposite two sides can be a square or a rectangle.
the rest 4 sides are rectangular
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Think about it logically. A brick balances with 3/4 of a brick plus 1/4 of a brick, so 3/4 lb. must be 1/4 of a brick. Thus, a brick must weigh 3 lbs.
The question does not specify the units used for the size of each brick. Assuming the brick's dimensions are given in inches, each brick covers 4" x 8" = 1/3 ft x 2/3 ft = 2/9 sq ft. Area to be covered = 320 sq ft so minimum number of bricks required = 320 / (2/9) = 1440 bricks. That answer assumes that the area to be covered is well behaved and that all offcuts are used.
Divide The Little Shape By The Big Shape ,
A shape with 7 sides.
2d