In a class, there are 18 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 ?

A. 6 B. 12
C. 18 D. 24

• 12
  
  In a class, there are 18 boys who are over 160 cm tall. If these constitute three-fourths of the boys , then total no of boys = 18*4/3 = 24 boys.
  the total number of boys (24)is two-thirds of the total number of students in the class, then total students = 24*3/2= 36
  no. of girls = 36-24=12
• 13 years agoHelpfull: Yes(2) No(0)
• total student=x
  no of boys=2x/3
  no of girls=1x/3
  but
  3/4of 2x/3=18
  6x/12=18
  x=36
  =>no of gorls=36/3=12
• 9 years agoHelpfull: Yes(0) No(0)