Hello there!
As we can see from a glance, that this wheel is split into 8 different sections.
There are 3 blues pieces, 2 green pieces, 2 red pieces, and 1 yellow piece.
So, the chance of landing on green since there is 2 green pieces out of a total of 8 pieces.
Therefore, the answer would be 2/8. But, we can convert it into a percentage and that would be 25%.