AMC 12A 2012 #6
Posted:
Fri Jun 15, 2012 9:33 pm
by nsguy1350
The sums of three whole numbers taken in pairs are 12, 17, and 19. What is the middle number?
Re: AMC 12A 2012 #6
Posted:
Sat Jun 16, 2012 11:46 am
by darksaber21
Okay, so this is how I would do this, set up three equations:
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Now, I would just set the last two equations equal to each other and solve for the middle number (Which I set as y):
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And just in case, if you plug in that to the other equations, you get:
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