There are a total of 60 students in a class and the ratio of the number of boys to that of the girls is 4 : 1, respectively. If 22 of the boys from this class are vegetarians, then find the number of non-vegetarian boys from the same class .

26

Boys : Girls

  4    :   1

⇒ (4 + 1) units = 60

⇒ 5 units = 60

⇒ 1 unit = 12

⇒ Boys = 4 x 12 = 48,

⇒ 22 boys are vegetarian, therefore non vegetarian = 48 - 22 = 26.