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All I know is Mx=x1m1+x2m2+...xnmn

here is my problem, i don't know if i should split the pyramid into 4ths or not.

The Great Pyramid of Cheops at El Gizeh, Egypt, had a height H = 144.9 m before its topmost stone fell. Its base is a square with edge length L = 233 m. Its volume V is equal L2H/3. Assuming that it has uniform density p(rho) = 1.8 x 103 kg/m3.

(a) What is the original height of its center of mass above the base?

(b) What is the work required to lift all the blocks into place from the base level?