Afarmer harvested 1/3 of her corn crop on monday and 3/7 of her crop on tuesday. what fraction of the crop was harvested for two days?

To solve this problem, you have to find the common denominator. Since 3 and 7 share no common factors, you can just multiply them together. The common denominator would be 21. 1/3 = 7/21 and 3/7 = 9/21.
7/21 + 9/21 = 16/21. Since 16/21 is already in simplest form, that is the final answer.
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