or perhaps more simply
score1 = score1 + new_points*033
score 2 = score2 + new_points*0.66
total_score = score1 + score2
or you could do
score1 = score1 + new_points
score 2 = score2 + new_points
total_score = (score1 + 2*score2)/3
lots of different ways to do this. what I would say is that sometimes it's nice to convert scores back to integer numbers or a fixed number of decimals.. so
integers, use floor or round or ceil
fixed decimal places, I use (floor ( score*100))/100