Question 1054777
In terms of just units:
[ liters ] x [ ml / liter ] = [ ml ]
The conversion factor, [ ml/liter ] = {{{ 1000/1 }}}
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Also:
[ liters/wkday ] x [ wkdays/wk ] = [ liters/wk ]
So, I can say:
{{{ (2.5*5 + 3 )*( 1000/1 ) }}}  = volume of water, in 
milliliters, Sasha drinks each week. 
{{{ ( 12.5 + 3 )*1000 = 15.5*1000 }}}
{{{ 15.5*1000 = 15500 }}}
15,500 ml/wk