Atank is full of water. find the work required to pump the water out of the spout. (use 9.8 m/s2 for g. use 1000 kg/m3 as the density of water. assume r = 9 m and h = 3 m.

 tank has  spherical shape . The distance from  the centre of mass =
h+r = 12 
Weight of water in tank = 9.8×π×9³×1000×4/3
 = 29.926×10⁶ N 
 to empty the tank Work done  = 12 × 29.926 × 10⁶
  = 359 × 10⁶ J
  = 359 MJ. hope this helps

We really need the picture in order to answer.

-- We suspect that the tank may be a cylinder, and that 'r' and 'h'
may be its radius and height respectively.  But we can't be sure.

-- Even if we were sure of the tank's shape, we don't know whether
the tank is a laying down cylinder or a standing up cylinder.

-- Most perplexing of all, we have no idea where on the tank
the spout is located.  That makes a big difference.