Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 11)
11.
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:
Answer: Option
Explanation:
Let A, B, C represent their respective weights. Then, we have:
A + B + C = (45 x 3) = 135 .... (i)
A + B = (40 x 2) = 80 .... (ii)
B + C = (43 x 2) = 86 ....(iii)
Adding (ii) and (iii), we get: A + 2B + C = 166 .... (iv)
Subtracting (i) from (iv), we get : B = 31.
B's weight = 31 kg.
Discussion:
41 comments Page 5 of 5.
Durga Charan said:
2 weeks ago
Sum of A,B,C = 45 * 3 = 135.
Sum of A,B = 40 *2 = 80.
Sum of B,C = 43 *2 = 86.
And the weight of B = (80+86) - 135 = 31.
Sum of A,B = 40 *2 = 80.
Sum of B,C = 43 *2 = 86.
And the weight of B = (80+86) - 135 = 31.
(1)
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