math for 7th grade

Question

Two angles of a quadrilateral measure 185° and 135°. The other two angles are in a ratio of 3:5. What are the measures of those two angles?

Answer 1

all 4 angles sum to 360

if 2 are 185+135

the other two sum to 360-184-135 =360-320= 40 degrees

in a ratio of 3:5, one angle is 3/8 and the other 5/8 of 40 degrees

3/8 x 40 = 120/8 = 15 degrees

the other angle = 5/8 of 40 = 25 degrees