Answer:
(3x+5y)/8
Step-by-step explanation:
The total amount is 150+250=400
We then do (3x+5y)/2 × 1/400
This equals (3x+5y)/800
We multiply that by 100 giving us the final answer.
bearing in mind that an explicit form is simply the sequence written as a function of some variables, so we simply simplify and add like-terms.

I'm pretty sure it is 5:55