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| Math Central | Quandaries & Queries |
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jacob, a student: the sum of two numbers is 45 and their difference is 15. what are the two numbers? |
Hi Jacob,
Let's translate your information into two equations:
x+y=45
x-y=15
If we add the equations together we get 2x=60 so one of the numbers is 30. If we plug 30 in for x in either one of the equations we determine that the second number is 15.
Hope this helps,
Janice
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