Answers

Add 15/60 and 21/60

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

Steps for adding fractions

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

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