Design the gating system along with riser for casting a

cuboid $({20}^{**}{20}^{**}15)c{m}^3$ of gray cast iron. Consider density of

material ad $7\mathrm{.}15g\frac{m}{c}c,$ fluidity as $28$ inches, casting yield

$0\mathrm{.}7,$ cope height $50mm.$ Assume other data if required.