Data Sufficiency (DS) | Re: If some of the passengers of the boat Silver Trout board the

Ans is C
let x members on boat Silver Trout and y on Lovely Mary.
A is insufficient as it does not say anything about other boat and so AD ruled out
B is insufficient as same reason above

combine them

0.25x=.50y
x=2y
let straut has 10 member then mary will have 5
clearly this info is sufficient to judge which boat has max numbers of persons.

C is the answer

---