A gambler has won 40% of his 40 poker games for the week so far. If, all of a sudden, his luck changes and he begins winning 80% of the time, how many more games must he play to end up winning 60% of all his games for the week?	Choose the correct choice
A) 20  B) 25  C) 30  D) 35  E) 40

Rationale: "let x be the number of additional games the gambler needs to play . 0.4 ( 40 ) + 0.8 x = 0.6 ( x + 40 ) 0.2 x = 8 x = 40 the answer is e ."
Answer: E