Answer:
65 marbles
Step-by-step explanation:
2:6 = x-20:x using the information in the problem
2x = 6x-120, and therefore x = 30. 30 is the number of green marbles.
We can find that the multiplier is 30/6 = 5. So there will be 5*2 = 10 red marbles. 5*5 = 25 blue marbles.
30+10+25 = 65 marbles total.
