Let's assume that Bill's age is x years old.
Since Eric is 4 years younger than Bill, Eric's age would be (x - 4) years old.
According to the given information, the sum of their ages is 28.
Therefore, x + (x - 4) = 28
By combining like terms, we get 2x - 4 = 28
Next, add 4 to both sides: 2x = 32
To solve for x, divide both sides by 2: x = 16
So, Bill's age is 16 years old, while Eric's age is (16 - 4) = 12 years old. Answer: \boxed{Bill is 16 years old and Eric is 12 years old}.
two brothers, bill and eric, are 4 years apart. And bill is the older of the two. if the sum of the boys ages equals 28, how old is bill and how old is eric?
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