No. 1: A water system of 2 inches (inside diameter) pipe, having a length of 1/4mile, is to be flushed with a volume of water equal to twice that contained in the system. How much water
(number of gallons) must be flushed through the system. (1f13 = 7.481 gallons)

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.

by definition every angles supplementary opposite by vertex are congruent