The writer is not qualified being my student.

The f(x,y) the larger the better for X, but inverce for Y,the other Eq. is -.6y + .4=0.

get the same number.but,....I think you should Know.The Q is not good because you don't know it is game or Prob Q. If it is game, X takes sea is optimal. So.I use 007 and coin ....