Event held N days before or after another: find its date or the gap in days

1. A.
   6 days
2. B.
   5 days
3. C.
   4 days
4. D.
   7 days

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1. A.
   $13^{th}$ August
2. B.
   $14^{th}$August
3. C.
   $15^{th}$ August
4. D.
   $16^{th}$ August

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1. A.
   $5^{th}$ Jan
2. B.
   $15^{th}$ Jan
3. C.
   $12^{th}$ Jan
4. D.
   $20^{th}$ Jan

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