Question

in the exam the sum of the score of a and b is 120 that of B and C 130 and a that of c and is 140 then the score of c is

Answer 1

Hello here is your answer by Sujeet yaduvanshi ☝☝☝☝☝☝☝☝☝☝☝

Solution:-The sum of the scores of A and B = 120 
The sum of the scores of B and C = 130
The sum of the scores C and A = 140

Then, the sum of the scores of A, B and C = (120 + 130 + 140)/2
 = 390/2
 = 195 

The scores of C = The scores of A, B and C – the scores of A and B 
 = 195 – 120

 = 75

Then, the scores of C 75. 

Answer 2

a+b=120
b+c=130
a+c=140
in eq2
b=130-c
substitute above equation in eq1
a+130-c=120
in eq3
a=140-c
substituting above equation in previous equation
140-c+130-c=120
2c=150
c=75