In a certain triangle, the measure of one angle is twice the measure of the smallest angle. The measure of the third angle is 7 times as great as the measure of the smallest angle. Find the measures o.
a) 30°, 60°, 90°
b) 20°, 40°, 140°
c) 10°, 20°, 140°
d) 15°, 30°, 105°