How are these representations the same? how are these representations different? pls help

1- identificar select the category that corresponds to each term. january 23 11: 59 pm unlimited attempts remaining grade settings 276-279 vocabulary list modelo fiesta quinceañera casada adolescencia viudo juventud navidad niñez vejez aniversario de bodas divorciado madurez cumpleaños soltera

Me because some of question i don’t understand

The sum of two numbers is 12 and their difference is 18 what are the two numbers