Answer :

**(a)** Here,

It is given in the question that:

Total number of students = 30

Number of students like to play football = 6

Also,

Number of students like to play cricket = 12

Now,

We can calculate the number of liking tennis as follows:

= Total number of students – (Number of students liking football + Number of students liking cricket)

= 30 – (6 + 12)

= 30 – 18

= 12

Hence,

Ratio of number of students liking football to the number of students liking tennis can be calculated as follows:

=

=

=

**(b)** We already know that,

Number of students liking cricket = 12

And,

Total number of students = 30

Hence,

Ratio of number of students liking cricket to the total number of students can be calculated as follows:

=

=

=

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