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 one:
A) 20	B) 25	C) 30	D) 35	E) 40
Let x be the number of additional games the gambler needs to play.   0.4(40) + 0.8x = 0.6(x+40)   0.2x = 8   x = 40   The answer is 40.
<result>E</result>
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?