How do I do 5, I think it is 17.5 for X and 19.2 for Y but I feel it’s wrong

What is (28 + 7 + 6 + 3) x 1/2 show your work

Afamily of five rents a kayak and splits the total time, k, equally. each family member spent less than 25 minutes kayaking. which values can be used to complete the math sentence below so that it accurately represents the situation? intro done

What is the range for 31,39,29,34,37,24,36,33,34,28