 
 <prompt> Wetin be di average age of di 1st and 5th fastest dogs if di 1st fastest dog na 10 years old, di 2nd fastest dog na 2 years younger pass di 1st fastest dog, di 3rd fastest dog na 4 years older pass di 2nd fastest dog, di 4th fastest dog na half di age of di 3rd fastest dog, and di 5th fastest dog na 20 years older pass di 4th fastest dog? <response>: If di 1st fastest dog na 10 years old, and di 2nd fastest dog na 2 years younger pass di 1st fastest dog, di 2nd fastest dog na 10-2=8 years old.
Di 3rd fastest dog wey dey 4 years older pass di 2nd fastest dog, e mean say di 3rd fastest dog na 8+4=12 years old.
Di 4th fastest dog na half di age of di 3rd fastest dog, so di 4th fastest dog na 1/2*12=6 years old.
Di 5th fastest dog na 20 years older pass di 4th fastest dog, so di 5th fastest dog na 6+20=26 years old.
Di total age of di 1st and 5th fastest dogs na 26+10=36 years
Di average age of di 1st and 5th fastest dogs na 36/2=18 years old.

Di answer go be 18. 