John is 24 years younger than his dad. The sum of their ages is 68 years. How many years old is John?
I need to find John's age, so I'll call that J. Then, John's dad's age must be J + 24, since he is 24 years older. The sum of their ages is 68, so I can write an equation: J + (J + 24) = 68. To solve for J, I'll simplify and combine like terms: 2J + 24 = 68. Then, I'll subtract 24 from both sides: 2J = 44. Finally, I'll divide both sides by 2: J = 22. So, John is 22 years old.

