How many new mothers are staying in Children$$s Hospital? $($e$.$g$.,$ WIP$=\_\_\_$ in weeks$)$

Note: Flow time $($T$)=3/7$ weeks

Question $4$ options:

a$)$

$27\mathrm{.}43$ mothers

b$)$

$448$ mothers

c$)$

$86\mathrm{.}57$ mothers

d$)$

$192$ mothers