SOLUTION: David eats 3 more cashews per minute than Casey does, and he can eat 80 of them in the same time it takes her to eat 56.. How fast do each of them eat cashews?

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Question 329187: David eats 3 more cashews per minute than Casey does, and he can eat 80 of them in the same time it takes her to eat 56.. How fast do each of them eat cashews?
Answer by Edwin McCravy(20064) About Me  (Show Source):
You can put this solution on YOUR website!
David eats 3 more cashews per minute than Casey does, and he can eat 80 of them in the same time it takes her to eat 56.. How fast do each of them eat cashews? 
Make this chart,  Let x be the time:


           cashews        time          rate in 
            eaten      in minutes     cashews/minute  
David        80             x             80%2Fx 
Casey        56             x             56%2Fx

     To get the equation, use the first sentence in the problem:

            David's rate = Casey's rate + 3

                  80%2Fx%22%22=%22%2256%2Fx%22%22%2B%22%223       

Solve that for x and get x = 8 minutes

So David's rate is 80%2Fx=80%2F8=10 cashews per minute
So Casey's rate is 56%2Fx=56%2F8=7 cashews per minute

Edwin