The boys and girls in a college are in the ratio 3 : 2. If 20% of the boys and 25% of the girls are adults, the percentage of students who are not adults is :

a. 58%
b. 67.5%
c. 78%
d. 82.5%

• let total students will be 100 divide it in 3:2 =60/40
  20 % 60=12 boys adult
  25 % 40= 10girls adults
  total adults = 22
  no of students =100
  100-22=78
  78% are non adult
  
• 9 years agoHelpfull: Yes(6) No(0)
• let 3x and 2x be the no. of boys and girls than we get total students 5x now
  20% of boys and 50% of girls are adult than we get total=5x- (20% of 3x + 50% of 2x) =1.1x
  1.1x*100/5x=22%(total adults)
  total non adults will be 78%
• 6 years agoHelpfull: Yes(1) No(1)