Use the equation 15% = 10% + 5% to find a 15% tip on a bill of $37.75. (round the bill to the nearest dollar before finding the tip amount.)

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.