The mass of a bucket full of water is 15 kg. it is being pulled up from a 15m deep well. due to a hole in bucket 6 kg of water flows out. find the work done in pulling it out of the well.,

Solution:
workdone = change in potential energy 
W = Force times distance

= ( m -dm)g • ( x)
= mgx -(dm(gx))
= (15 × 10 × 15) -(6/15 gx.dx)
=2250 - (6/15 x10x 225/2)
=2250 -  (3 x 15x 10)
= 2250 - 450
= 1800 Joule
The answer is  1800 Joules.

B? i think so but hope that's right and answers your question