Explain completely why 1/3+1/4 equals 7/12 and not 2/7

1/3+1/4=7/12 and not 2/7 because, when you go to transform the fractions with the least common denominator, you will use 12. 1/3 equals 4/12 and 1/4 equals 3/13.
Therefore, you must use the least common denominator and you should NOT ADD THE DENOMINATORS if you add the denominators, you will just get a complete different answer.

121 pints. they had 176 and drank 55

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