Walkabout wrote:

During a certain season, a team won 80 percent of its first 100 games and 50 percent of its remaining games. If the team won 70 percent of its games for the entire season, what was the total number of games that the team played?

(A) 180

(B) 170

(C) 156

(D) 150

(E) 105

Total # of games = x

# of games won in first 100 = .8 * 100

# of games won in remaining games = .5 * (x-100)

# of games won in entire season = .7x

Now, .7x = .8 * 100 + .5 * (x-100)

.7x - .5x = 80 - 50

.2x = 30

x = 300/20 = 150

Ans: D