What is the number pattern from 10 to 30 to 90 to? and ? to?

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

answer: procent 54 wynosi 33,33%