$(6$ points$)$ An activated sludge basin receives primary effluent at a flow rate of $550\frac{L}{s}.$ The primary effluent $BO{D}_5$ is $110m\frac{g}{L_{?}}$ and the reactor volatile suspended solids concentration is $3300m\frac{g}{L}.$ The biomass in the waste activated sludge $($WAS$)$ is $11,000m\frac{g}{L}$ and the volume of the aeration basin is $8{10}^3{m}^3.$ The cell retention time is $7\mathrm{.}2$ d $.$

a$.$ Find the F$/$M ratio $($in $g\frac{S}{g}x**d).$

b$.$ Find the WAS flowrate $($in $\frac{m^3}{d}).$