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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1350/depth of the concrete in feet
1 cubic yard of concrete fills 27/depth in feet square feet.
9 sq feet
81 Square feet.
divide by 9