Sima is 3655 days old. Mario’s cousin is 298 days older than Sima. Mario is 189 days younger than his cousin. How many days old is Mario?

The correct answer is: 3764 days

Sima’s total age = 3655 days
Mario’s cousin age = 298 days older than Sima’s age
= 3655 + 298 = 3953 days
Mario’s total age = 189 days younger than his cousin
= 3953 – 189 = 3764 days.