In a class, there are 15 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 ?
Pick
A) 10	B) 12	C) 18	D) 24	E) 26
Explanation:   Let the number of boys be x. Then, (3/4)x = 15 or x = 15 x(4/3) = 20.   If total number of students is y, then (2/3) y = 20 or y = 20 x (3/2) = 30.   Therefore Number of girls in the class = (30 - 20)= 
<gadget id="calculator">(30 - 20)</gadget>
<output>10</output>
10.   10nswer: 10
<result>A</result>
In a class, there are 15 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 ?