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8 inch x 16 inch concrete block is actually 2/3 foot x 4/3 foot block

Area of one block is 2/3 x 4/3 = 8/9 square feet

Number of blocks in 310 square feet = (310)/(8/9) = (310) x (9/8) = 155 x 9/4 which is 1395/4 = 348.75 blocks

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