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Lemony

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

iGreen

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.

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