- Thread starter proteek
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- Jun 18, 2007

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When does the day count begin - with 'S' sending the first letter or 'R' receiving the first letter?S sends a letter to R every day (every 24 hours). However R receives a letter every 25 hours. How many letters will R have have received by the 25th day?

Please show us what you have tried and *exactly where you are stuck*.

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- Joined
- Jan 27, 2012

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If postal people are willing to deliver at 1 or 2 in the morning and he gets a letter every 25 hours, there 25 hours/letter. We need to cancel "hours" and get "letters" Since "letters" is in the denominator we need to "invert" "hours/letter"- we need to divide (24)(25) hours by 25 hours per letter giving (24)(25)/25= 24 letters.