Answer to Problem # 16:

 Bro  =   2  x  Me      Bro  -  Me  =   13   

Substitute:  (2  x  Me)  for  Bro

(2 x Me) - Me    =   13      2 Me -  Me    =   13      

                           Me   =   13 (ANSWER)



Note: If your brother will be 13 years older than you in 10 years

from now, he is now (and will always be) 13 years older than you !

 

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