Respuesta :

Add up the 3 weeks 5 days and 13 days and then subtract for 87 days and their is ur remainder
Since 1 week has 7 days, you would multiply 3x7 for 21 days. Add up the other days 5&13, and add them to 21 for a total of 39. Then simply subtract 39 from 81 for an answer of 42.
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