A gambler has won 40% of his 30 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?
Select
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(30) + 0.8x = 0.6(x+30)   0.2x = 6   x = 30   The answer is 30.
<result>C</result>
A gambler has won 40% of his 30 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?