Answers

Add 21/42 and 15/42

21/42 + 15/42 is 6/7.

Steps for adding fractions

1. Add the two fractions:
   21/42 + 15/42 = 21 + 15/42 = 36/42
2. 36/42 simplified gives 6/7
3. So, 21/42 + 15/42 = 6/7

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