Answers

Add 15/21 and 20/21

15/21 + 20/21 is 5/3.

Steps for adding fractions

1. Add the two fractions:
   15/21 + 20/21 = 15 + 20/21 = 35/21
2. 35/21 simplified gives 5/3
3. So, 15/21 + 20/21 = 5/3
   In mixed form: 12/3

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