Find the measure of ∠a if ∠a = 3 2 x + 20 ∠b = 7 2 x + 20 ∠c = 5 2 x + 40 ∠d = 3 2 x + 10

The measure of all the internal angles need to measure 360. How you do this question is you add all the angle measurements and then equal them to 360. Find x and to find the measure of angle A you just insert the measure of x in the problem. 
32x+20+72x+20+32x+10+52x+40=360 (add)
188x+90=360 (subtract 90 from both sides)
188x=270 (divide both sides by 188)
x=1.4 
32(1.4)+20=66 (rounded)