Who is asking: Parent
I want to start by simplifying the right side of the second and third exprressions.
Now look at the first exprerssion, a + b + c = 180. Since c = b + 20 we can replace c in the first expression by b - 20 to get
But the second equation we know now says b = a + 55 and hence
Now you can use the simplified second equation to find b and then the simplifies third equation to find c. You should then check your answer by substituting the values of a, b and c you found into the original three equations to make sure they are valid.Penny
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