Anything with 2 Yellow and more than 3.5 Blue
The answer is pretty obvious, but I will give a more mathimatical explanation that is easy to understand. The ratio is saying that for every 2 units of yellow, there are 3.5 units of blue. You can find ratios that are the same but use more/ less amounts. So if you use 4 units of yellow and 7 of blue it is the same ratio.
If you multiply both parts of the ratio (or divide) by the same number you will always get the same ratio. So if you want something more blue (or yellow) you just have to keep one the same while increasing the one you want to have more effect.
This question is a bit more up to you. The paint has to be a green that is more yellow, so as long as you add more yellow than blue, your answer should be correct! For example 3 cups of yellow to 1 cup of Blue, or 3.3 yellow to 2 cups of blue
to double the amount u double the equation
green = 2y+3.5b