The sum of number of boys and girls in a school is 400. If the number of boys is x, then the number of girls becomes x% of the total number of students. The number of boys is?
Choose the most appropriate option:	A) 50	B) 40	C) 60	D) 80	E) 70
We have x+x% of 400 = 400   x + x/100 * 400 = 400   5 * x = 400   x = 80   Answer is 80
<result>D</result>
The sum of number of boys and girls in a school is 400. If the number of boys is x, then the number of girls becomes x% of the total number of students. The number of boys is?