A student traveled 30 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?
Select.
A) 240	B) 200	C) 160	D) 100	E) 50
Let x be the total length of the trip.   0.3x + 20 miles + 0.5x = x   20 miles = 0.2x   x = 100 miles   The answer is 100.
<result>D</result>
A student traveled 30 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?