Can u guys please tell me which won is the right answer?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

I’m really confused and need your assist me with this question i’ve never been taught