Number 23 can’t figure it out

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.