Well, I don't think I was allowed to play so I did not give it a try. (Well actually I noticed yesterday that there was only one reply, so I worked it out this morning in case you gave an extension and opened it to all players.)
So, as the next in my series of helpful suggestions, how about wiping the slate clean every Monday? In other words, assuming you continue taking the weekend off (which you most certainly deserve), Friday's winners can play on Monday. As it stands today, if I want to make sure to play on Maths Friday, I can really only play twice a week, Tuesday or Wednesday, then Friday. (This assumes I always get the right answer, which is not necessarily a given.)
Fill in the gaps:
