PLEASE HELP! The question is in the description

Question

The sum of the interior angle measures of a quadrilateral is 360º. Angle Q is twice the measure of angle P. Angle R is (3b - 19)º and angle S is (3b + 10)º. Find the value of b.

Answer 1

assuming angle P=b...

angle Q=2b

add the four angles together

b+2b+(3b-19)+(3b+10)=360

9b-9=360

9b=360+9

9b=369

b=369/9

b=41º