Respuesta :

First question:

Reduce the ratio

  150 ml
------------
   0.3 l

Do this by use of the appropriate conversion factor:

  150 ml       1 liter         150 liter
------------ * ------------ = ------------- = 0.5 liter.
   0.3 l         1000 ml       300

Darren drinks more milk:  0.5 liter versus Randy's 0.3 liter.