Como se hace esta porfi?

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

If 25% of y is 30, what is 60% of y?