
Kenneth S. answered 02/05/18
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If you mean that 2/7 of the original total were sold on Monday, and then on Tuesday she sold 1/3 OF THAT ORIGINAL AMOUNT, then she sold 2/7 + 1/3 of the original total.
It's possible that the question may have intended that 1/3 of the #n of muffins that REMAINED after Monday's sales, but that is not what the wording given to us says, so the answer is as given in my first paragraph.
YOU CAN ADD TWO FRACTIONS BY CONVERTING EACH TO USE A COMMON DENOMINATOR.