What is 5 4/5 + 3 7/8 ????

 5 4/5 + 3 7/8

 

= 29/5 + 31/8

= ((29 × 8) + (31 × 5)) / (5 × 8)

= (232 + 155) / 40

= 387/40

= 9 27/40