Of the 420 students enrolled in basic math, only 30% are first-year students. How many are first-year students? How
many are not?

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step-by-step explanatio89

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.

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2y+y=5

add 2y and y