Easy
(Using the same equations as the previous question) What is the number representing A+B+C?
Explanation
Explanation
Adding the three given equations: (A+B)+(B+C)+(C+A)=50+70+84=204, which equals 2(A+B+C). So A+B+C=204/2=102.
PRO TIP
Re-check your working by substituting the answer back into the original question.