In a class, there are 24 boys who are over 160 cm tall. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class ? Choose the most appropriate option.
A) 6  B) 12  C) 18  D) 16  E) 26
Explanation:   Let the number of boys be x. Then, (3/4)x = 24 or x = 24 x(4/3) = 32.   If total number of students is y, then (2/3) y = 32 or y = 32 x (3/2) = 48.   Therefore Number of girls in the class = (48 - 32)= 
<gadget id="calculator">(48 - 32)</gadget>
<output>16</output>
16.   Answer: 16
<result>D</result>
In a class, there are 24 boys who are over 160 cm tall. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class ?