Respuesta :
1/8 of the sandwiches.
step by step: 1/2+3/8 =4/8+3/8
4/8+3/8= 7/8
meaning 1/8 of the sandwich is left for john to eat
step by step: 1/2+3/8 =4/8+3/8
4/8+3/8= 7/8
meaning 1/8 of the sandwich is left for john to eat