SOLUTION: It takes a computer 8 days to print all of personalized letters for a national sweepstakes. A new computer is purchased that can do the same job in 5 days. How long would it take t
Algebra ->
Expressions-with-variables
-> SOLUTION: It takes a computer 8 days to print all of personalized letters for a national sweepstakes. A new computer is purchased that can do the same job in 5 days. How long would it take t
Log On
Question 348108: It takes a computer 8 days to print all of personalized letters for a national sweepstakes. A new computer is purchased that can do the same job in 5 days. How long would it take to do the job with both computers working on it? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! It takes a computer 8 days to print all of personalized letters for a national sweepstakes. A new computer is purchased that can do the same job in 5 days. How long would it take to do the job with both computers working on it?
----
Older computer rate = 1/8 job/day
---
new computer rate = 1/5 job/day
-----
Let together rate = 1/x
===============================
Equation:
rate + rate = together rate
1/8 + 1/5 = 1/x
5x + 8x = 40
13x = 40
x = 40/13 = 3.08 days (time working together)
=====================================================
Cheers,
Stan H.
(