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.
Avneet said:
9 years ago
A + B + C = 45 * 3 = 135.
A + B = 40 * 2 = 80.
B + C = 43 * 2 = 86.
Now, (A + B + C ) - (A + B) = C i.e. 55,
Vice versa for the value of A i.e. 49.
Substitute the value of A in A + B = 80.
B will be 31.
A + B = 40 * 2 = 80.
B + C = 43 * 2 = 86.
Now, (A + B + C ) - (A + B) = C i.e. 55,
Vice versa for the value of A i.e. 49.
Substitute the value of A in A + B = 80.
B will be 31.
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