Max is 9 years older than John. In years, the sum of their ages will be 49. Find Max's present age

29

Step-by-step explanation:

Max's age = x

John's age = y

We know:

x = y + 9 x + y = 49

Using the system of two functions, we plug the first equation inside the other:

(y + 9) + y = 49

2y = 40

y = 20

Now let's substitute this value into one of the equations so to find x

x = 20 + 9 = 29