Alecia walked 3/10 of a mile from school, stopped at the grocery store on the way, then walked another 4/10 of a mile home.

i hope this is what you were looking for.

see attached graph

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.