Answers

Add 21/63 and 15/63

21/63 + 15/63 is 4/7.

Steps for adding fractions

1. Add the two fractions:
   21/63 + 15/63 = 21 + 15/63 = 36/63
2. 36/63 simplified gives 4/7
3. So, 21/63 + 15/63 = 4/7

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