The sum of Mario and Maria's ages now is 7. Mario is 1 year older than Maria. How old is Mario?
Thoughts? Step-by-step reasoning:
If x is Maria's age, then Mario's age is x + 1. The equation that represents the sum of their ages is x + x + 1 = 7. By combining like terms, the equation becomes 2x = 6. Hence, the value of x which represents the age of Maria is 6 / 2 = 3. So Mariu is 3 + 1 = 4 years old.
Thus, the answer is 4.