If a+b+c= 35 and b+c= 25 then c =?

Answer 1

Hello!

In this case, it's a simple substitution problem! Substitute b+c = 25 into the original problem, and you get

a + 25 = 35

Then from there you can deduce

a = 35 - 25

a = 10

And from there, just start from the beginning! So

10 + b + c = 35

b + c = 35 - 10

b + c = 25

So your answer would be

c = 25 - b

Unfortunately, this problem does sort of loop around, since there are three variables, and two equations.