Respuesta :
he built 15 robots (4 + 8 + 3) = 15
he built an average of 5 robots per day....(4 + 8 + 3) / 3 = 15/3 = 5
he built an average of 5 robots per day....(4 + 8 + 3) / 3 = 15/3 = 5