Solve this:

Dear student,
Answer is 3)
Water potential is equal to the sum of pressure potential and solute potential.
ψ = ψ P + ψ S 
In case of X  
ψ = 25 + (-50) = -25
In case of y
ψ = 30 + (-40) = -10
In case of z
ψ = 5 + (-20) = -15
Therefore water potential in decreasing order y > z > x
So, the answer is 3 where water moves from y to x and z and from z to x

Regards