There are 7 more girls than boys in a class. there are 23 students in the class in all. how many girls are there in th class. what are the unknowns in this problem

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