SOLUTION: Cant figure this out. Help Please! :) The apartments in Kellys apartment house are numbered consecutively on each floor. The sum of his number and his next door neighbors num

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Question 185533: Cant figure this out. Help Please! :)
The apartments in Kellys apartment house are numbered consecutively on each floor. The sum of his number and his next door neighbors number is 1419. What are the two numbers>?

Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
Remember, consecutive numbers follow the form: x, x+1, x+2, etc...

So for example, the numbers 1, 2, 3, 4, and 5 are consecutive numbers


So because "The apartments in Kellys apartment house are numbered consecutively on each floor", this means that Kelly's apartment number is either one more or one less than her neighbors.

Let's make x = Kelly's number


and let's make her neighbor be one more, which means that x+1=neighbor's number



Now since "The sum of his number and his next door neighbors number is 1419", this tells us that

Kelly's Number + Neighbor's Number = 1419


which also looks like





-------------------------------------------

Now let's solve for "x":


Start with the given equation.


Combine like terms.


Subtract from both sides.


Combine like terms on the right side.


Divide both sides by to isolate .


Reduce.


----------------------------------------------------------------------

Answer:

So the answer is


This means that Kelly's house number is 709 and her neighbor's is 710


Check:

709+710=1419
1419=1419 ... works

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