Answers

Add 21/60 and 15/60

21/60 + 15/60 is 3/5.

Steps for adding fractions

1. Add the two fractions:
   21/60 + 15/60 = 21 + 15/60 = 36/60
2. 36/60 simplified gives 3/5
3. So, 21/60 + 15/60 = 3/5

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