If A = 1/7 and B = 1/8 and the average of A, B and C is 1/13 , then the value of C is:

If A = 1/7 and B = 1/8 and the average of A, B and C is…

If A = $\frac{1}{7}$ and B = $\frac{1}{8}$ and the average of A, B and C is $\frac{1}{13}$ , then the value of C is:

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e. $-\frac{27}{728}$ .

Average = Sum/Number of observations

According to the given question,

A + B + C = 3/13

Also, A + B = 1/7 + 1/8

⇒ 15/56

Now, C = 3/13 - 15/56

⇒ C = (168 - 195)/728

⇒ C = -27/728