Answers

Add 15/42 and 21/42

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

Steps for adding fractions

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

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