98 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 correct choice from the following.
A) 110 B) 140 C) 220 D) 250 E) 500

Rationale: "let b be the number of boys in the school . 98 = xb / 100 b = 0.5 x 9800 = 0.5 x ^ 2 x ^ 2 = 19600 x = 140 the answer is b ."
Answer: B