Out of 30 students in a class, like football, 12 like cricket and remaining like tennis. Find the ratio of: (a) Number of students liking football to number of students liking tennis. (b) Number of students liking cricket to total number of students.

Total number of students = 30
Number of students like football = 6
Number of students like cricket = 12
Thus number of students like tennis = 30 – 6 – 12 = 12

(a) The ratio of students like football that of tennis = 6/12 = 1/2 =1:2

(b) The ratio of students like cricket to that of total students = 12/30 = 2/5 = 2:5

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