Final answer:
By setting up an equation considering their age difference and the sum of their ages in 7 years, we find that Mauricio is currently 27 years old.
Step-by-step explanation:
Mauricio is 4 years older than Kristyn. This relationship can be expressed with an equation where if Kristyn's current age is k, then Mauricio's current age would be k + 4. In 7 years, Mauricio will be (k + 4) + 7, and Kristyn will be k + 7. Together, their ages will sum up to 64 years.
To find Mauricio's current age, we use the equation (k + 4) + 7 + (k + 7) = 64 to combine the future ages and set them equal to 64. This simplifies to 2k + 18 = 64, leading to 2k = 46 after we subtract 18 from both sides. Dividing both sides by 2 gives us k = 23, which means Kristyn is currently 23 years old. Therefore, Mauricio is 23 + 4 = 27 years old now.