If the measures of two opposite angles of a parallelogram are represented by 3x+40 and x+50 what is the measure of each angle of the parallelogram

Opposite angles in a parallelogram are congruent, so 3x+40 = x+50 and x = 5.  That means that those 2 angles measure 3(5)+40 = 55, and the other 2 angles, which are congruent to each other, add up with the other to equal 360. 360-55-55=250.  Divide that between the other 2 remaining angles to get that those angles each measure 125.

A) 70:10:20 = 7:1:2
b) 20/100 = 2/10 = 1/5