There are 10 concrete block per m2.
90 * 140 acres = 50,990 390.9 m2
20.66 blocks per m2 when laid flat (block size 100 x 440 x 215)
13 m2
140 m2
50
1 cent = 40468 m2
10000 cm2 in one m2
If it has one, it'll attach to the engine at the bottom of the oil pan, and, on some engines, the right side of the block.
complete: 1300cm2=------M2
5000 m2 is 1.24 acres.
1000 m2 = 0.247 acres