If you had to do all your laundry in only two loads, how would you do it?
You only have a small amount of laundry (one person's laundry for the week - as an adult living alone might have).
You have may use the washing machine twice per week only - either way you may not wash more than two machine loads per week and have no access to a launderette or another machine). You may not save any washing between weeks. So it all has to be washed, it fits into two machines easily.
Would you just separate by colour (lights and darks) and wash everything at 40 degrees?
Or would you do a hot load of towels, bedding and underwear in one machine and a 30 or 40 degree load of clothes in the other machine, without separating by colour?