Choose the final w$/$c $($water$-$to$-$cement ratio$)$ desirable for your concrete if there are multiple w$/$c suggestions $($see below$)$ and the workability requirement is properly met for all w$/$c options.

$0\mathrm{.}34$

$0\mathrm{.}43$

$0\mathrm{.}40$

$0\mathrm{.}52$