128 students represent x percent of the boys at a school. If the boys at the school make up 50% of the total school population of x students, what is x? Choose the most appropriate option:
A) 160 B) 190 C) 225 D) 250 E) 500

Rationale: let b be the number of boys in the school . 128 = xb / 100 b = 0.5 x 12800 = 0.5 x ^ 2 x ^ 2 = 25600 x = 160 the answer is a .
Answer: A