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The average weight of three boys A, B and C is 54  kg, while the average weight of three boys B, D and E is 53 kg. What is the average of the weight of A, B, C, D, E, F?

(a)    52.4 kg                    (b)  53.2 kg               (c) 53.8 kg        (d) Data inadequate


Question ID - 50828 :-

The average weight of three boys A, B and C is 54  kg, while the average weight of three boys B, D and E is 53 kg. What is the average of the weight of A, B, C, D, E, F?

(a)    52.4 kg                    (b)  53.2 kg               (c) 53.8 kg        (d) Data inadequate

1 Answer
5876 Votes
3537

Answer Key : (d) -

Total weight of  kg = 163 kg.

Total weight of  kg = 159 kg.

Adding both, we get = kg = 322 kg.

So, to find the average weight of  we ought to know B’s weight, which is not given. So, the data is inadequate.



Next Question :

A Plano-convex lens (focal length f2, refractive index 2, radius of curvature R) fits exactly into a Plano-concave lens (focal length f1, refractive index 1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :

(a)

f1 − f2

(b)

f1 + f2

(c)

 

(d)

 


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