A student traveled 25 percent of the distance of the trip alone, continued another 20 miles with a friend, and then finished the last half of the trip alone. How many miles long was the trip? Pick:  A) 60  B) 80  C) 100  D) 120  E) 150
Let x be the total length of the trip.   0.25x + 20 miles + 0.5x = x   20 miles = 0.25x   x = 80 miles   The answer is 80.
<result>B</result>
A student traveled 25 percent of the distance of the trip alone, continued another 20 miles with a friend, and then finished the last half of the trip alone. How many miles long was the trip?