Bob is 5 years older than his brother Kevin. the sum of their ages is 17 how old is bob?

Answer 1

Let's call Bob the letter B and Kevin the letter K:

B=K+5 (since Bob is 5 years older than Kevin)
B+K=17 (the sum of their ages combined is 17)

Since we have a value for B, we can substitute that into the equation B+K=17.

(K+5)+K=17
2K+5=17
2K=12
K=6

So since Kevin is 6 years old, this means that Bob is 6+5=11 years old.