The ratio of red to green is 13 : 5
There are 600 green marbles, so 5 units = 600 marbles.
Thus, 1 unit = 600 / 5 = 120 marbles
Since there are 13 units of red marbles, the number of red marbles is:
120 * 13
= 1560 marbles
Hence, there are 1560 red marbles in the jar.