HELP WITH MATHS PROBLEM ? ABOUT POLYGONS .THANKS !?

Answer is 6 (six). Two of the interior angles are 157 and 95 deg. The exterior angle 21 means, interior angle of 180-21=159 deg. sum of all 4 angles is 157+95+159+159 = 570. For a polygon having 5 sides, the sum of all interior angles is (5-2)*180=540. So, this polygon should have more than 5 sides. For a polygon of 6 sides, the sum of all interior angles is (6-2)*180=720 deg. and it will have 6 angles. The sum of the last 2 angles should be 720-570=150 deg. and that is possible. I feel, 6 should be correct.