Someone help pleasee I don’t understand this and it’s due in 30 minutes

Answer:
Red Marbles: 600 900
Blue Marbles: 900 1300
Step-by-step explanation:
Answer:
800 blue marble
Step-by-step explanation:
if the ratio is 3:4, multiply Each by 100 and you get 300:400, then multiply by 2 and you get 600:800.