Parallelogram pqrs is shown angle s is (3x)° angle r is 120° and angle q is (2y)° find the value of y

Parallelograms have adjacent angles supplementary (sum to 180).
For pair r and s, 
3x+120=180, => x=(180-120)/3=20 ° 
Similarly, for pair q and r,
2y+120=180 => y=(180-120)/2 = 30 °