Mr zucco baked a total of 270 cupcakes and muffins. after ue sold 1/3 of the cupcakes and baked 18 more miffins, he had twice as many cupcakes as muffins. how many cupcakes and muffins did mr. zucco bake to begin with?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.