Answer is 35:25:81=======================================================Explanation:The ratio we want is in the format green:red:total which means we list the number of green first, then the number of red next, then the number total last. The order is very important. This is because we'll simply list the numbers without saying the color name or "total". So the reader will imply what the numbers refer to, based on this order mentioned.We have:50 red70 green42 yellow50+70+42 = 120+42 = 162 totalThe ratio of green to red to total is 70:50:162To reduce the ratio, we divide all three parts of that ratio by the GCF 270/2 = 3550/2 = 25162/2 = 81The ratio 70:50:162 fully reduces to 35:25:81 which is the final answer.This says that for every 35 green marbles, we have 25 red marbles and 81 total marbles.