Posted by carolyn on Tuesday, October 19, 2010 at 10:18pm.
assuming the concrete is in liquid form and poured into moulds
each block is 24x24x4 or 2304 cubic inches
number of cubic inches in one cubic yard
= 36x36x36 = 46656
number of blocks = 46656/2304 = 20.25
He can make 20 blocks, (not enough for 21)
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