120:160 would be the original, bulky answer. Just think that there’s 120 of blue paint and 160 of yellow paint. It’s a lot simpler than it sounds. The ratio of blue to yellow paint is just, 120:160.
Then you want to simplify it by finding the greatest number that each side of the ratio can be divided by, and in this case it would be reduced to 3:4, because each number can be divided by 40.
120 and 160 are big numbers, so just take the zero off and you’re only dealing with 12 and 16. So 4 is the greatest common factor, and just slap a zero on it because you took it off before.
Lmk if this helped and if you have more questions!
