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 70% of the time, how many more games must he play to end up winning 60% of all his games for the week?
Pick:
A) 36  B) 42  C) 48  D) 54  E) 60
Let x be the number of additional games the gambler needs to play.   0.4(30) + 0.7x = 0.6(x+30)   0.1x = 6   x = 60   The answer is 60.
<result>E</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 70% of the time, how many more games must he play to end up winning 60% of all his games for the week?