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Try this problem, should be pretty easy if you understand how to do it:

c+b-t=170

t+b-c=130

What is b?

 Jan 19, 2022
 #1
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+1

 

Add the two equations.  The c's and the t's go away, leaving 2b = 300   =>  b = 150  

 Jan 19, 2022
 #2
avatar+189 
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Noice, that's exactly how I would do it.

ImDecentAtMath  Jan 19, 2022

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