Answer: 55 blue marbles and 25 red marbles.
Explanation:
It is given that the ratio of blue marbles to red marbles is 11:5, meaning that for every 11 blue marbles, Jaxson has 5 red ones. This means that the pattern repeats for every 16 marble colors (11+5=16).
80 marbles / 16 marbles per repeating pattern = 5 times
This means that within the 80 marbles, the ratio happens 5 times. Next, we can multiply this value by the ratio to see how many of each marble colour he has.
11:5 * 5 ➜ 55:25 ➜ 55 blue marbles and 25 red marbles.