Kevin is currently twice as old as his brother. If Kevin was eight years old two years ago, how old is Kevin's brother now?

k = 2b

k - 2 = 8

k - 2 = 8

Add 2 to both sides:

k = 10

Plug in 10 for 'k' in the first equation:

10 = 2b

Divide 2 to both sides:

b = 5

So his brother is 5 years old now.

So first you add 8 and 2 to get 10. This means that Kevin is 10 years old now. If he is currently twice as old as his brother it means that you divide 10 by 2 to get 5. Kevin's brother is 5 years old.

Answer: 5 years old