The sum of number of boys and girls in a school is 900. 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 one:
A) 50
B) 40
C) 60
D) 90
E) 70
We have x+x% of 900 = 900   x + x/100 * 900 = 900   10 * x = 900   x =90   Answer is 90
<result>D</result>
The sum of number of boys and girls in a school is 900. 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?