Question

How do you figure this

Answer 1

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.

Answer 2

Add up the 3 weeks 5 days and 13 days and then subtract for 87 days and their is ur remainder