if A+B =60 B +C =70 C +A=80 A +B +C=?

correct answer is 105

A+B=60(Given) =)B=60-A............eq1 B+C=70(Given) =)C=70-B =)C=70-(60-A) =)C=70-60+A...........eq2 C+A=80(Given) =)A=80-C =)A=80-(70-60+A) =)A=80-70+60-A =)A+A=80-70+60 =)2A=70 =)A=70/2 so, A=35 Now, A+B=60 =)35+B=60 =)B=60-35 so, B=25 B+C=70 =)25+C=70 =)C=70-25 so, C=45 Hence, A=35 B=25 C=45 so, A+B+C=) 35+25+45=105. Am I right?

Obviously 105... I'm a mathematical student....

Right answer is A+B+C Equal to 105..

Solution:- A + B = 60 .......1) B + C = 70 .......2) Suppose that, these are equation 1 and 2. After subtracting equations 1 and 2, A - C = -10 Or, C - A = 10 .......3) Given, C + A = 80 .....4) After adding equations 3 and 4, 2C = 90 Or, C = 45 After putting the value of C in equation 3, A = 45 - 10 = 35 After putting the value of A in equation 1, B = 60 - 35 = 25 Then, A + B + C = 35 + 25 + 45 = 105