a student traveled 25 percent of the distance of the trip alone , continued another 40 miles with a friend , and then finished the last half of the trip alone . how many miles long was the trip ?
"let x be the total length of the trip . 0.25 x + 40 miles + 0.5 x = x 40 miles = 0.25 x x = 160 miles the answer is c ."
divide(40, subtract(subtract(const_1, inverse(25)), divide(const_1, const_2)))