Final answer:
While specific data for Irish teenagers was not provided, global trends indicate a significant percentage of teenagers have weight problems. Obesity rates have doubled worldwide since the 1980s, implying a higher estimate for teenage weight issues in Ireland might be more appropriate.
Step-by-step explanation:
The question asks about the percentage of teenagers in Ireland who have a weight problem. Although specific data for Ireland was not provided, we can infer from global trends that weight problems among adolescents is a concerning issue. For instance, the obesity rate in teenagers has tripled since 1980, showing a disturbing trend in rising weight issues. Furthermore, the World Health Organisation indicated that obesity rates had doubled worldwide since the 1980s.
Looking at the broader context helps to give some insight. For example, over 70 percent of Americans are currently overweight or obese, and the level of childhood obesity is increasing. In another country like Australia, 60 percent of adults and one in four children are overweight. These trends suggest that weight issues are a pervasive problem in developed countries, which likely extends to Ireland's adolescent population. Given the options provided (10%, 20%, 30%, 40%), a safe estimate, based on the global trends, might lean towards a higher percentage rather than a lower one. However, without specific data for Irish teenagers, it would be speculative to select an exact figure.