Pls help in this qs

Dear student

a)Substance B is maximum soluble in water.
b)Mass of B required to dissolve in 100g at 320K is 48g
So, in 50g the mass required will be 48/100 x 50 
                                                     =24g

c)In increasing order the solubilty is 
C< A< B 

d)Generally, with increase in temperature, the solubility of salt increases. 
The general graph is of this type:


Regards