Eight out of 10 dentist prefer crest toothpaste. what is the ratio of dentist who do not prefer crest to those who do?

2:8 is the ratio of those who do not to those who do

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

is there any photos or whatever?