Giving brainliest please help with math

It’s 15 because the ratio of the ones that are running for a cause is 120:800 and they wanna know the ratio of who is running for the cause out of 100 so it would be ?:100 but to find the answer you would divide 120 by 8 since 800 divided by 8 is 100 which would give you the answer of 15 participants participating for the cause

ya. Thank you so much