120 students represent x percent of the boys at a school. If the boys at the school make up 30% of the total school population of x students, what is x? Choose the correct answer:  A) 120  B) 150  C) 180  D) 200  E) 250
Let B be the number of boys in the school.   120 = xB/100   B = 0.3x   12000=0.3x^2   x^2 = 40000   x = 200   The answer is 200.
<result>D</result>
120 students represent x percent of the boys at a school. If the boys at the school make up 30% of the total school population of x students, what is x?