There are about 320 million people in the United States. Of these, how many would you predict wear glasses, then how many would your predict wear corrective lenses, and how many would you predict wear contacts

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120