A concrete mixture will be designed. The $28-$day compressive strength of the concrete by using $15$x$15$x$15$cm cubic specimens is required to be $25$MPa$.$ Slump of the fresh concrete is specified as $10$cm$.$ Maximum size of the aggregate is $19$mm$.$ Other necessary data are given as:

Specific gravity of cement $=3\mathrm{.}1$

Bulk specific gravity of both aggregates $=2\mathrm{.}7$

Fineness modulus of fine aggregate $=2\mathrm{.}6$

Dry rodded unit weight of the coarse aggregate $=1600$kg$/$m$3$

Absorption capacity of coarse aggregate$=1\%$

Absorption capacity of fine aggregate$=2\%$

Answer the following accordingly:

a$)$What should be the water contents of the concrete?

b$)$What should be the water$/$cement ratio?

c$)$ Determine the amount of SSD coarse aggregate?

d$)$ Determine the amount of SSD fine aggregate?