Broad street divides Popperville into an east side and a west side. On the east side of Popperville, 20% of the children qualify for a reduced-priced lunch. On the west side of Poppervile, 30% of the children qualify for a reduced-price lunch. Is it correct to calculate the percentage of children in all of Popperville who qualify for a reduced-priced lunch by adding 20% and 30% to get 50%? If the answer is no, why not? Explain in detail and calculate the correct percentage in at least two examples.